| name | ui-ux-pro-max-components |
| description | UI/UX Pro Max v8.0 — Components, Patterns & Validation. Use this file when the query is about React components, accessibility (a11y), motion presets, validation/audit, advanced patterns, or creative brief workflows. Contains Module 1 (Creative Brief Engine), Module 4 (Component Library), Module 5 (Motion Presets), Module 6 (Validation & Audit), Module 8 (Cross-Reference Integration), and Module 10 (Advanced Patterns). For design tokens, CSS primitives, data tables, and theming, see PART-A-INFRASTRUCTURE.md.
|
| version | 8.0.0 |
UI/UX Pro Max v8.0 — Part B: Components & Patterns
Component Library and Implementation Patterns — Components, motion, validation, and advanced patterns.
Pair with Part A for design tokens, CSS primitives, and theming.
Cross-Reference: Part A Dependencies
This file provides component implementations and patterns. For design tokens, CSS primitives, data tables, and theming, see PART-A-INFRASTRUCTURE.md.
- Module 4 components → consume Part A Module 2 tokens and Module 9 themes
- Module 1 MATCH step → queries Part A Module 7 data tables
- Module 5 motion presets → reference Part A Module 3 CSS primitives
- Module 6 validation → checks Part A Module 2 contrast compliance
MODULE 1: CREATIVE BRIEF ENGINE
1.1 Triage Questions (Ask Only What You Must)
| # | Question | Why | Default |
|---|
| 1 | Target platform? | Determines component model and input model | web |
| 2 | Stack (if code)? | Determines syntax and available primitives | html-tailwind |
| 3 | Goal and constraints? | Conversion, speed, brand vibe, WCAG level | conversion + WCAG AA |
| 4 | Existing assets? | Screenshot, Figma, repo, URL, user journey | none |
| 5 | Industry / product type? | Determines palette, typography, pattern | General SaaS |
If the user says "all of it" (design + UX + code + design system), treat as four deliverables and ship in that order.
1.2 Anti-Pattern Detection Checklist
Before generating ANY UI, scan the request and existing code for these 34 red flags:
Critical (Block shipping)
| # | Red Flag | Detection | Fix |
|---|
| 1 | Math.random() in SSR component | Search for Math.random inside render | Use deterministic pseudo-random: (index * 9301 + 49297) % 233280 / 233280 |
| 2 | Broken Google Fonts URLs | Font not on fonts.google.com | Replace with verified alternatives (see Part A Module 7.3) |
| 3 | Zero keyboard navigation | Tabs/Accordion with no key handlers | Add roving tabindex + arrow keys + Home/End (see Module 4) |
| 4 | Modal without focus trap | aria-describedby, aria-controls missing | Add focus trap + inert backdrop + aria-describedby |
| 5 | color-scheme without OKLCH fallback | Only hex in dark mode tokens | Add OKLCH with hex fallback for older browsers |
| 6 | Conditional hook calls | useId/useEffect inside if/ternary | Always call hooks unconditionally; use id ?? generatedId |
| 7 | forwardRef in React 19 | Using forwardRef() wrapper | Use ref as a regular prop: function Comp({ ref, ...props }) |
| 8 | useId() called conditionally | `id | |
High (Must fix before delivery)
| # | Red Flag | Detection | Fix |
|---|
| 9 | No prefers-reduced-motion | Animation without reduced-motion check | Wrap all animations in motion preference check |
| 10 | Layout-shifting hover states | scale/transform on hover without reserve space | Use opacity/color transitions or reserve transform space |
| 11 | Low-contrast text | Contrast ratio < 4.5:1 for body text | Verify with WCAG contrast checker |
| 12 | Emoji used as UI icons | Emoji characters in button/icon context | Replace with SVG icons (Lucide, Heroicons) |
| 13 | Missing cursor-pointer | Clickable elements without cursor:pointer | Add cursor-pointer to all interactive elements |
| 14 | Instant state changes | No transition on interactive elements | Add transition 150-300ms |
| 15 | Invisible focus states | No :focus-visible styling | Add focus ring with 3px offset |
| 16 | No skip link | Page missing skip-to-content link | Add skip link as first focusable element |
| 17 | Images without alt text | img tags without alt attribute | Add descriptive alt text |
| 18 | Form inputs without labels | Input without associated label | Add label + htmlFor/id association |
| 19 | Contradictory ARIA | e.g., role="status" + aria-hidden="true" | Remove aria-hidden from live regions |
| 20 | Redundant ARIA roles | e.g., role="radiogroup" on fieldset | Remove redundant role when semantic HTML suffices |
Medium (Should fix)
| # | Red Flag | Detection | Fix |
|---|
| 21 | Barrel file imports | import { X } from '@/components' | Import directly: import X from '@/components/X' |
| 22 | No content-visibility | Long lists without content-visibility | Add content-visibility: auto on off-screen list items |
| 23 | No CSS nesting | Deep BEM or excessive utility repetition | Use native CSS nesting (see Part A Module 3) |
| 24 | Missing design tokens | Hard-coded color/spacing values | Extract to CSS custom properties |
| 25 | Stale tool references | References to deprecated tools | Update to 2026 ecosystem (see Part A Module 7.4) |
| 26 | No container queries | Responsive via media queries only | Add container queries for component-level responsive |
| 27 | Missing loading/empty/error states | Only happy path implemented | Add all three states for every data-dependent component |
| 28 | No @layer usage | All CSS at same specificity level | Organize into @layer base, components, utilities |
| 29 | Unoptimized images | Raw img tags without lazy loading or optimization | Use framework image component or native loading="lazy" |
| 30 | useCallback + IIFE for derived data | useCallback(() => { ... }, deps)() | Replace with useMemo(() => { ... }, deps) |
| 31 | No useEffect cleanup | Event listeners/timers without cleanup | Add return () => cleanup in useEffect |
| 32 | Hard-coded DOM IDs in forms | id="name" instead of register-managed IDs | Let register() manage IDs via useId() |
| 33 | window.location.reload() for retry | Full page reload on error | Pass onRetry callback prop |
| 34 | No dark: variants on components | Components only styled for light mode | Add dark: variants to all Tailwind classes |
1.3 AI-Executable Workflow
IDENTIFY → Parse request, detect industry, stack, constraints
MATCH → Search data tables (Part A Module 7) for best-fit style/palette/font/rule
COMMIT → Generate design system with OKLCH tokens (Part A Module 2)
CHECK → Run anti-pattern checklist (1.2) + validation (Module 6)
IDENTIFY Step
Extract from user request:
- product_type: SaaS | e-commerce | healthcare | fintech | ...
- style_keywords: [minimal, dark, playful, ...]
- stack: react | nextjs | vue | svelte | html-tailwind | ...
- a11y_level: AA (default) | AAA | none
- motion_budget: full | reduced | none
MATCH Step
Run the design system generator:
python3 skills/ui-ux-pro-max/scripts/search.py "<product_type> <style_keywords>" --design-system -p "Project Name"
Or search individual domains:
python3 skills/ui-ux-pro-max/scripts/search.py "<keyword>" --domain <domain> [-n <max_results>]
Available domains: product, style, color, landing, typography, chart, ux, icons, react, web
COMMIT Step
Generate the design system with persistence:
python3 skills/ui-ux-pro-max/scripts/search.py "<query>" --design-system --persist -p "Project Name"
This creates:
design-system/MASTER.md — Global source of truthdesign-system/pages/<page>.md — Page-specific overrides (only deviations)
CHECK Step
Run the pre-delivery checklist from Module 6 before delivering any code.
MODULE 4: COMPONENT LIBRARY
4.0 Component Standards
Every component in this module follows these standards:
- React 19 patterns: No forwardRef (use ref prop directly), use() for async data, ref prop exposed on key components
- Accessibility: Full keyboard navigation, ARIA attributes, screen reader support
- Motion: GSAP integration via useGSAP hook, prefers-reduced-motion respected
- Deterministic: No Math.random() in render — use index-based pseudo-random or counters
- Dark mode: All components include
dark: Tailwind variants
- TypeScript: All components export their interface types
Type Exports
All components export their TypeScript interfaces for external use:
export interface AccordionItem { id: string; title: string; content: React.ReactNode; disabled?: boolean; }
export interface SelectOption { value: string; label: string; disabled?: boolean; }
export interface Toast { id: string; message: string; variant: 'success' | 'error' | 'warning' | 'info'; duration?: number; }
4.1 Accordion
'use client';
import { useRef, useState, useCallback, useId } from 'react';
import { useGSAP } from '@gsap/react';
import gsap from 'gsap';
export interface AccordionItem {
id: string;
title: string;
content: React.ReactNode;
disabled?: boolean;
}
export interface AccordionProps {
items: AccordionItem[];
allowMultiple?: boolean;
ref?: React.Ref<HTMLDivElement>;
}
function Accordion({ items, allowMultiple = false, ref }: AccordionProps) {
const [openItems, setOpenItems] = useState<Set<string>>(new Set());
const accordionId = useId();
const toggle = useCallback((id: string) => {
setOpenItems(prev => {
const next = new Set(prev);
if (next.has(id)) {
next.delete(id);
} else {
if (!allowMultiple) next.clear();
next.add(id);
}
return next;
});
}, [allowMultiple]);
const handleKeyDown = useCallback((e: React.KeyboardEvent) => {
const buttons = items.filter(i => !i.disabled);
const currentIdx = buttons.findIndex(
b => b.id === (e.target as HTMLElement).getAttribute('data-item-id')
);
switch (e.key) {
case 'ArrowDown': {
e.preventDefault();
const next = buttons[(currentIdx + 1) % buttons.length];
document.getElementById(`${accordionId}-trigger-${next.id}`)?.focus();
break;
}
case 'ArrowUp': {
e.preventDefault();
const prev = buttons[(currentIdx - 1 + buttons.length) % buttons.length];
document.getElementById(`${accordionId}-trigger-${prev.id}`)?.focus();
break;
}
case 'Home': {
e.preventDefault();
document.getElementById(`${accordionId}-trigger-${buttons[0].id}`)?.focus();
break;
}
case 'End': {
e.preventDefault();
const last = buttons[buttons.length - 1];
document.getElementById(`${accordionId}-trigger-${last.id}`)?.focus();
break;
}
}
}, [items, accordionId]);
return (
<div
ref={ref}
role="region"
aria-label="Accordion"
onKeyDown={handleKeyDown}
>
{items.map((item) => (
<AccordionItemComponent
key={item.id}
item={item}
isOpen={openItems.has(item.id)}
onToggle={() => toggle(item.id)}
accordionId={accordionId}
/>
))}
</div>
);
}
function AccordionItemComponent({
item, isOpen, onToggle, accordionId
}: {
item: AccordionItem;
isOpen: boolean;
onToggle: () => void;
accordionId: string;
}) {
const contentRef = useRef<HTMLDivElement>(null);
const triggerId = `${accordionId}-trigger-${item.id}`;
const contentId = `${accordionId}-content-${item.id}`;
useGSAP(() => {
if (!contentRef.current) return;
const prefersReduced = window.matchMedia('(prefers-reduced-motion: reduce)').matches;
if (prefersReduced) return;
if (isOpen) {
gsap.to(contentRef.current, {
height: 'auto',
opacity: 1,
duration: 0.3,
ease: 'power2.out',
});
} else {
gsap.to(contentRef.current, {
height: 0,
opacity: 0,
duration: 0.2,
ease: 'power2.in',
});
}
}, { dependencies: [isOpen], scope: contentRef });
return (
<div>
<h3>
<button
id={triggerId}
aria-expanded={isOpen}
aria-controls={contentId}
aria-disabled={item.disabled}
data-item-id={item.id}
onClick={item.disabled ? undefined : onToggle}
className="w-full flex items-center justify-between py-4 text-left dark:text-gray-100"
>
{item.title}
<svg
className={`w-5 h-5 transition-transform duration-200 ${isOpen ? 'rotate-180' : ''} dark:text-gray-300`}
aria-hidden="true"
viewBox="0 0 20 20"
fill="currentColor"
>
<path fillRule="evenodd" d="M5.23 7.21a.75.75 0 011.06.02L10 11.168l3.71-3.938a.75.75 0 111.08 1.04l-4.25 4.5a.75.75 0 01-1.08 0l-4.25-4.5a.75.75 0 01.02-1.06z" clipRule="evenodd" />
</svg>
</button>
</h3>
<div
ref={contentRef}
id={contentId}
role="region"
aria-labelledby={triggerId}
style={{ height: isOpen ? 'auto' : 0, overflow: 'hidden', opacity: isOpen ? 1 : 0 }}
>
<div className="pb-4 dark:text-gray-300">{item.content}</div>
</div>
</div>
);
}
4.2 Tabs
'use client';
import { useState, useCallback, useRef, useId } from 'react';
export interface TabItem {
id: string;
label: string;
content: React.ReactNode;
disabled?: boolean;
}
export interface TabsProps {
items: TabItem[];
defaultTab?: string;
ref?: React.Ref<HTMLDivElement>;
}
function Tabs({ items, defaultTab, ref }: TabsProps) {
const [activeTab, setActiveTab] = useState(defaultTab || items[0]?.id);
const tabListId = useId();
const handleKeyDown = useCallback((e: React.KeyboardEvent) => {
const enabledTabs = items.filter(i => !i.disabled);
const currentIdx = enabledTabs.findIndex(t => t.id === activeTab);
let nextIdx = currentIdx;
switch (e.key) {
case 'ArrowRight':
case 'ArrowDown':
e.preventDefault();
nextIdx = (currentIdx + 1) % enabledTabs.length;
break;
case 'ArrowLeft':
case 'ArrowUp':
e.preventDefault();
nextIdx = (currentIdx - 1 + enabledTabs.length) % enabledTabs.length;
break;
case 'Home':
e.preventDefault();
nextIdx = 0;
break;
case 'End':
e.preventDefault();
nextIdx = enabledTabs.length - 1;
break;
default:
return;
}
const nextTab = enabledTabs[nextIdx];
setActiveTab(nextTab.id);
document.getElementById(`${tabListId}-tab-${nextTab.id}`)?.focus();
}, [items, activeTab, tabListId]);
return (
<div ref={ref}>
<div role="tablist" aria-label="Content tabs" onKeyDown={handleKeyDown}>
{items.map((item) => (
<button
key={item.id}
id={`${tabListId}-tab-${item.id}`}
role="tab"
aria-selected={activeTab === item.id}
aria-controls={`${tabListId}-panel-${item.id}`}
aria-disabled={item.disabled}
tabIndex={activeTab === item.id ? 0 : -1}
onClick={() => !item.disabled && setActiveTab(item.id)}
className="px-4 py-2 dark:text-gray-300 dark:hover:text-white"
>
{item.label}
</button>
))}
</div>
{items.map((item) => (
<div
key={item.id}
id={`${tabListId}-panel-${item.id}`}
role="tabpanel"
aria-labelledby={`${tabListId}-tab-${item.id}`}
hidden={activeTab !== item.id}
tabIndex={0}
>
{item.content}
</div>
))}
</div>
);
}
4.3 Modal / Dialog
'use client';
import { useRef, useEffect, useCallback, useId } from 'react';
export interface ModalProps {
isOpen: boolean;
onClose: () => void;
title: string;
description?: string;
children: React.ReactNode;
ref?: React.Ref<HTMLDialogElement>;
}
function Modal({ isOpen, onClose, title, description, children, ref }: ModalProps) {
const dialogRef = useRef<HTMLDialogElement>(null);
const setDialogRef = useCallback((node: HTMLDialogElement | null) => {
(dialogRef as React.MutableRefObject<HTMLDialogElement | null>).current = node;
if (typeof ref === 'function') ref(node);
else if (ref) (ref as React.MutableRefObject<HTMLDialogElement | null>).current = node;
}, [ref]);
const previousFocusRef = useRef<HTMLElement | null>(null);
const titleId = useId();
const descId = useId();
useEffect(() => {
const dialog = dialogRef.current;
if (!dialog) return;
if (isOpen) {
previousFocusRef.current = document.activeElement as HTMLElement;
dialog.showModal();
} else {
if (dialog.open) {
dialog.close();
}
previousFocusRef.current?.focus();
}
}, [isOpen]);
const handleKeyDown = useCallback((e: React.KeyboardEvent) => {
if (e.key === 'Escape') {
e.preventDefault();
onClose();
return;
}
if (e.key !== 'Tab') return;
const dialog = dialogRef.current;
if (!dialog) return;
const focusable = dialog.querySelectorAll<HTMLElement>(
'a[href], button:not([disabled]), textarea, input, select, [tabindex]:not([tabindex="-1"])'
);
const first = focusable[0];
const last = focusable[focusable.length - 1];
if (e.shiftKey && document.activeElement === first) {
e.preventDefault();
last?.focus();
} else if (!e.shiftKey && document.activeElement === last) {
e.preventDefault();
first?.focus();
}
}, [onClose]);
return (
<dialog
ref={setDialogRef}
onClose={onClose}
onKeyDown={handleKeyDown}
aria-labelledby={titleId}
aria-describedby={description ? descId : undefined}
className="rounded-xl p-0 backdrop:bg-black/50 backdrop:backdrop-blur-sm dark:bg-gray-900 dark:text-gray-100"
>
<div className="p-6">
<h2 id={titleId} className="text-xl font-semibold">{title}</h2>
{description && (
<p id={descId} className="mt-2 text-sm text-gray-500 dark:text-gray-400">{description}</p>
)}
<div className="mt-4">{children}</div>
<button
onClick={onClose}
className="mt-4 px-4 py-2 rounded-lg bg-gray-100 hover:bg-gray-200 dark:bg-gray-800 dark:hover:bg-gray-700 dark:text-gray-100"
autoFocus
>
Close
</button>
</div>
</dialog>
);
}
Fix: Added if (dialog.open) guard before dialog.close() to prevent double-close when onClose is called while the dialog is already closing. This was caused by both the Escape key handler and the <dialog> element's native onClose event both calling onClose.
ModalStackProvider for Nested Dialogs
When multiple modals are open simultaneously (e.g., a confirmation dialog on top of a form dialog), screen readers must know which modal is active. The ModalStackProvider manages aria-hidden across nested modals, ensuring only the topmost modal is accessible to assistive technologies.
'use client';
import { createContext, useContext, useState, useCallback, useRef } from 'react';
interface ModalStackEntry {
id: string;
element: HTMLElement;
}
const ModalStackContext = createContext<{
push: (entry: ModalStackEntry) => void;
pop: (id: string) => void;
} | null>(null);
function ModalStackProvider({ children }: { children: React.ReactNode }) {
const stackRef = useRef<ModalStackEntry[]>([]);
const push = useCallback((entry: ModalStackEntry) => {
if (stackRef.current.length > 0) {
const prev = stackRef.current[stackRef.current.length - 1];
prev.element.setAttribute('aria-hidden', 'true');
}
stackRef.current.push(entry);
}, []);
const pop = useCallback((id: string) => {
stackRef.current = stackRef.current.filter(e => e.id !== id);
if (stackRef.current.length > 0) {
const prev = stackRef.current[stackRef.current.length - 1];
prev.element.removeAttribute('aria-hidden');
}
}, []);
return (
<ModalStackContext.Provider value={{ push, pop }}>
{children}
</ModalStackContext.Provider>
);
}
4.4 Deterministic Skeleton
No Math.random() — SSR-safe with deterministic shimmer patterns. role="status" communicates loading state to screen readers; aria-hidden is NOT used because it contradicts role="status".
export interface SkeletonProps {
width?: string;
height?: string;
index?: number;
}
function Skeleton({ width, height, index = 0 }: SkeletonProps) {
const offset = ((index * 9301 + 49297) % 233280) / 233280;
const delay = `${offset * 1.5}s`;
return (
<div
role="status"
aria-label="Loading"
className="animate-pulse rounded-md bg-gray-200 dark:bg-gray-700"
style={{
width: width || '100%',
height: height || '1rem',
animationDelay: delay,
}}
>
<span className="sr-only">Loading...</span>
</div>
);
}
function SkeletonCard({ index }: { index: number }) {
return (
<div className="rounded-xl p-4 border border-gray-200 dark:border-gray-700 space-y-3">
<Skeleton height="2rem" index={index} />
<Skeleton height="1rem" width="80%" index={index + 1} />
<Skeleton height="1rem" width="60%" index={index + 2} />
</div>
);
}
Fix: Removed aria-hidden="true" from the Skeleton component. role="status" makes this a live region that screen readers should announce — adding aria-hidden="true" contradicts that purpose and makes the loading state invisible to assistive technologies.
4.5 Skip Link
function SkipLink() {
return (
<a
href="#main-content"
className="sr-only focus:not-sr-only focus:absolute focus:z-[9999] focus:top-4 focus:left-4 focus:px-4 focus:py-2 focus:bg-white focus:text-black dark:focus:bg-gray-900 dark:focus:text-white focus:rounded focus:shadow-lg"
>
Skip to main content
</a>
);
}
4.6 Focus Trap Utility
import { useEffect, useRef } from 'react';
function useFocusTrap(active: boolean) {
const containerRef = useRef<HTMLDivElement>(null);
useEffect(() => {
if (!active || !containerRef.current) return;
const container = containerRef.current;
const focusableSelector = 'a[href], button:not([disabled]), textarea, input, select, [tabindex]:not([tabindex="-1"])';
const handleKeyDown = (e: KeyboardEvent) => {
if (e.key !== 'Tab') return;
const focusable = container.querySelectorAll<HTMLElement>(focusableSelector);
const first = focusable[0];
const last = focusable[focusable.length - 1];
if (e.shiftKey && document.activeElement === first) {
e.preventDefault();
last?.focus();
} else if (!e.shiftKey && document.activeElement === last) {
e.preventDefault();
first?.focus();
}
};
container.addEventListener('keydown', handleKeyDown);
const firstFocusable = container.querySelector<HTMLElement>(focusableSelector);
firstFocusable?.focus();
return () => container.removeEventListener('keydown', handleKeyDown);
}, [active]);
return containerRef;
}
4.7 Screen Reader Announcer
function ScreenReaderAnnouncer() {
return (
<div
aria-live="polite"
aria-atomic="true"
className="sr-only"
id="sr-announcer"
/>
);
}
function announceToScreenReader(message: string) {
const announcer = document.getElementById('sr-announcer');
if (announcer) {
announcer.textContent = '';
requestAnimationFrame(() => {
announcer.textContent = message;
});
}
}
4.8 Cursor Follower
'use client';
import { useRef } from 'react';
import { useGSAP } from '@gsap/react';
import gsap from 'gsap';
function CursorFollower() {
const cursorRef = useRef<HTMLDivElement>(null);
useGSAP(() => {
const cursor = cursorRef.current;
if (!cursor) return;
const prefersReduced = window.matchMedia('(prefers-reduced-motion: reduce)').matches;
if (prefersReduced) {
cursor.style.display = 'none';
return;
}
const moveCursor = (e: MouseEvent) => {
gsap.to(cursor, {
x: e.clientX,
y: e.clientY,
duration: 0.5,
ease: 'power2.out',
});
};
window.addEventListener('mousemove', moveCursor);
return () => window.removeEventListener('mousemove', moveCursor);
}, { scope: cursorRef });
return (
<div
ref={cursorRef}
className="pointer-events-none fixed top-0 left-0 z-[9999] w-6 h-6 -ml-3 -mt-3 rounded-full border-2 border-blue-500 mix-blend-difference hidden md:block"
aria-hidden="true"
/>
);
}
4.9 AI-Specific Patterns
Thinking Indicator
function ThinkingIndicator() {
return (
<div
role="status"
aria-label="AI is thinking"
className="flex items-center gap-2 text-sm text-gray-500 dark:text-gray-400"
>
<div className="flex gap-1">
<span className="w-2 h-2 rounded-full bg-gray-400 dark:bg-gray-500 animate-bounce" style={{ animationDelay: '0ms' }} />
<span className="w-2 h-2 rounded-full bg-gray-400 dark:bg-gray-500 animate-bounce" style={{ animationDelay: '150ms' }} />
<span className="w-2 h-2 rounded-full bg-gray-400 dark:bg-gray-500 animate-bounce" style={{ animationDelay: '300ms' }} />
</div>
<span>Thinking...</span>
</div>
);
}
Uncertainty Notice
function UncertaintyNotice({ confidence }: { confidence: 'low' | 'medium' | 'high' }) {
if (confidence === 'high') return null;
return (
<div
role="note"
className="flex items-start gap-2 p-3 rounded-lg bg-amber-50 border border-amber-200 dark:bg-amber-900/20 dark:border-amber-800 text-sm"
>
<svg className="w-5 h-5 text-amber-500 dark:text-amber-400 flex-shrink-0 mt-0.5" viewBox="0 0 20 20" fill="currentColor" aria-hidden="true">
<path fillRule="evenodd" d="M8.485 2.495c.673-1.167 2.357-1.167 3.03 0l6.28 10.875c.673 1.167-.168 2.625-1.516 2.625H3.72c-1.347 0-2.189-1.458-1.515-2.625L8.485 2.495zM10 5a.75.75 0 01.75.75v3.5a.75.75 0 01-1.5 0v-3.5A.75.75 0 0110 5zm0 9a1 1 0 100-2 1 1 0 000 2z" clipRule="evenodd" />
</svg>
<div>
<p className="font-medium text-amber-800 dark:text-amber-300">
{confidence === 'low' ? 'Low confidence response' : 'Verify this information'}
</p>
<p className="text-amber-700 dark:text-amber-400 mt-1">
{confidence === 'low'
? 'This response may contain inaccuracies. Please verify important details independently.'
: 'This response should be verified before relying on it for critical decisions.'}
</p>
</div>
</div>
);
}
Composer / Chat Input
'use client';
import { useState, useRef, useCallback } from 'react';
function ChatComposer({ onSend, disabled }: {
onSend: (message: string) => void;
disabled?: boolean;
}) {
const [message, setMessage] = useState('');
const textareaRef = useRef<HTMLTextAreaElement>(null);
const handleSubmit = useCallback(() => {
const trimmed = message.trim();
if (!trimmed || disabled) return;
onSend(trimmed);
setMessage('');
if (textareaRef.current) textareaRef.current.style.height = 'auto';
}, [message, disabled, onSend]);
const handleKeyDown = useCallback((e: React.KeyboardEvent) => {
if (e.key === 'Enter' && !e.shiftKey) {
e.preventDefault();
handleSubmit();
}
}, [handleSubmit]);
const handleInput = useCallback(() => {
const textarea = textareaRef.current;
if (!textarea) return;
textarea.style.height = 'auto';
textarea.style.height = `${Math.min(textarea.scrollHeight, 200)}px`;
}, []);
return (
<div className="flex items-end gap-2 p-3 border rounded-xl dark:border-gray-700 dark:bg-gray-900">
<textarea
ref={textareaRef}
value={message}
onChange={(e) => setMessage(e.target.value)}
onKeyDown={handleKeyDown}
onInput={handleInput}
placeholder="Type a message..."
disabled={disabled}
rows={1}
className="flex-1 resize-none border-0 bg-transparent focus:ring-0 focus:outline-none text-sm dark:text-gray-100"
aria-label="Chat message input"
/>
<button
onClick={handleSubmit}
disabled={!message.trim() || disabled}
className="px-3 py-2 rounded-lg bg-blue-600 text-white disabled:opacity-50 disabled:cursor-not-allowed dark:bg-blue-500"
aria-label="Send message"
>
<svg className="w-4 h-4" viewBox="0 0 20 20" fill="currentColor" aria-hidden="true">
<path d="M3.105 2.289a.75.75 0 010 1.414l5.372 2.267-5.372 2.267a.75.75 0 000 1.414l14.5 6.125a.75.75 0 001.035-.936l-5.372-13.5a.75.75 0 00-1.398 0L6.893 8.704l-3.788-1.6z" />
</svg>
</button>
</div>
);
}
AI Controls Panel
function AIControlsPanel({ model, temperature, onModelChange, onTemperatureChange }: {
model: string;
temperature: number;
onModelChange: (model: string) => void;
onTemperatureChange: (temp: number) => void;
}) {
return (
<fieldset className="border rounded-lg p-4 space-y-3 dark:border-gray-700">
<legend className="text-sm font-medium px-2 dark:text-gray-300">AI Settings</legend>
<div className="flex items-center gap-3">
<label htmlFor="ai-model" className="text-sm text-gray-600 dark:text-gray-400 w-24">Model</label>
<select
id="ai-model"
value={model}
onChange={(e) => onModelChange(e.target.value)}
className="flex-1 px-3 py-1.5 rounded border text-sm dark:bg-gray-800 dark:border-gray-600 dark:text-gray-200"
>
<option value="gpt-4o">GPT-4o</option>
<option value="claude-4">Claude 4</option>
<option value="gemini-2.5">Gemini 2.5</option>
</select>
</div>
<div className="flex items-center gap-3">
<label htmlFor="ai-temp" className="text-sm text-gray-600 dark:text-gray-400 w-24">Temperature: {temperature}</label>
<input
id="ai-temp"
type="range"
min="0"
max="2"
step="0.1"
value={temperature}
onChange={(e) => onTemperatureChange(parseFloat(e.target.value))}
className="flex-1"
/>
</div>
</fieldset>
);
}
Conversation Thread
export interface Message {
id: string;
role: 'user' | 'assistant' | 'system';
content: string;
timestamp: Date;
confidence?: 'low' | 'medium' | 'high';
}
function ConversationThread({ messages }: { messages: Message[] }) {
return (
<div
role="log"
aria-label="Conversation"
aria-live="polite"
className="space-y-4"
>
{messages.map((msg) => (
<div
key={msg.id}
className={`flex gap-3 ${msg.role === 'user' ? 'justify-end' : 'justify-start'}`}
>
<div
className={`max-w-[70ch] rounded-xl px-4 py-3 text-sm ${
msg.role === 'user'
? 'bg-blue-600 text-white dark:bg-blue-500'
: 'bg-gray-100 text-gray-900 dark:bg-gray-800 dark:text-gray-100'
}`}
>
<p>{msg.content}</p>
{msg.confidence && msg.confidence !== 'high' && (
<UncertaintyNotice confidence={msg.confidence} />
)}
<time
className="block mt-1 text-xs opacity-60"
dateTime={msg.timestamp.toISOString()}
>
{msg.timestamp.toLocaleTimeString()}
</time>
</div>
</div>
))}
</div>
);
}
Contextual Actions
function ContextualActions({ actions }: {
actions: Array<{ label: string; icon: string; onClick: () => void; destructive?: boolean }>;
}) {
return (
<menu className="flex gap-1" aria-label="Contextual actions">
{actions.map((action) => (
<button
key={action.label}
onClick={action.onClick}
className={`p-2 rounded-lg transition-colors text-sm ${
action.destructive
? 'hover:bg-red-100 hover:text-red-700 dark:hover:bg-red-900/30 dark:hover:text-red-400'
: 'hover:bg-gray-100 dark:hover:bg-gray-800'
}`}
aria-label={action.label}
>
<span aria-hidden="true">{action.icon}</span>
<span className="sr-only">{action.label}</span>
</button>
))}
</menu>
);
}
4.10 Image Reveal Component
'use client';
import { useRef } from 'react';
import { useGSAP } from '@gsap/react';
import gsap from 'gsap';
import { ScrollTrigger } from 'gsap/ScrollTrigger';
gsap.registerPlugin(ScrollTrigger);
function ImageReveal({ src, alt }: { src: string; alt: string }) {
const containerRef = useRef<HTMLDivElement>(null);
useGSAP(() => {
const prefersReduced = window.matchMedia('(prefers-reduced-motion: reduce)').matches;
if (prefersReduced) return;
gsap.from(containerRef.current, {
clipPath: 'inset(0 100% 0 0)',
duration: 0.8,
ease: 'power3.inOut',
scrollTrigger: {
trigger: containerRef.current,
start: 'top 80%',
once: true,
},
});
}, { scope: containerRef });
return (
<div ref={containerRef} className="overflow-hidden rounded-lg">
{/* eslint-disable-next-line @next/next/no-img-element */}
<img src={src} alt={alt} className="w-full h-auto object-cover" loading="lazy" />
</div>
);
}
Fix: Added gsap.registerPlugin(ScrollTrigger) before using ScrollTrigger in the animation. Without this registration, GSAP will throw a runtime error.
4.11 Select / Dropdown
'use client';
import { useState, useRef, useCallback, useId, useEffect } from 'react';
export interface SelectOption {
value: string;
label: string;
disabled?: boolean;
}
export interface SelectProps {
options: SelectOption[];
value?: string;
onChange: (value: string) => void;
label: string;
placeholder?: string;
ref?: React.Ref<HTMLDivElement>;
}
function Select({
options, value, onChange, label, placeholder = 'Select...', ref
}: SelectProps) {
const [isOpen, setIsOpen] = useState(false);
const [activeIndex, setActiveIndex] = useState(-1);
const containerRef = useRef<HTMLDivElement>(null);
const listboxId = useId();
const buttonId = useId();
const selectedOption = options.find(o => o.value === value);
const enabledOptions = options.filter(o => !o.disabled);
useEffect(() => {
if (!isOpen) return;
const handleClickOutside = (e: MouseEvent) => {
if (containerRef.current && !containerRef.current.contains(e.target as Node)) {
setIsOpen(false);
}
};
document.addEventListener('mousedown', handleClickOutside);
return () => document.removeEventListener('mousedown', handleClickOutside);
}, [isOpen]);
const handleKeyDown = useCallback((e: React.KeyboardEvent) => {
switch (e.key) {
case 'ArrowDown':
e.preventDefault();
if (!isOpen) { setIsOpen(true); setActiveIndex(0); }
else { setActiveIndex(prev => Math.min(prev + 1, enabledOptions.length - 1)); }
break;
case 'ArrowUp':
e.preventDefault();
setActiveIndex(prev => Math.max(prev - 1, 0));
break;
case 'Home':
e.preventDefault();
setActiveIndex(0);
break;
case 'End':
e.preventDefault();
setActiveIndex(enabledOptions.length - 1);
break;
case 'Enter':
case ' ':
e.preventDefault();
if (isOpen && activeIndex >= 0) {
const option = enabledOptions[activeIndex];
onChange(option.value);
setIsOpen(false);
} else {
setIsOpen(true);
}
break;
case 'Escape':
setIsOpen(false);
break;
}
}, [isOpen, activeIndex, enabledOptions, onChange]);
const setRef = useCallback((node: HTMLDivElement | null) => {
(containerRef as React.MutableRefObject<HTMLDivElement | null>).current = node;
if (typeof ref === 'function') ref(node);
else if (ref) (ref as React.MutableRefObject<HTMLDivElement | null>).current = node;
}, [ref]);
return (
<div ref={setRef} className="relative">
<label htmlFor={buttonId} className="block text-sm font-medium mb-1 dark:text-gray-300">{label}</label>
<button
id={buttonId}
role="combobox"
aria-expanded={isOpen}
aria-controls={listboxId}
aria-activedescendant={activeIndex >= 0 ? `${listboxId}-${enabledOptions[activeIndex]?.value}` : undefined}
aria-haspopup="listbox"
onClick={() => setIsOpen(prev => !prev)}
onKeyDown={handleKeyDown}
className="w-full px-3 py-2 text-left rounded-lg border border-gray-300 bg-white hover:border-gray-400 focus:outline-none focus:ring-2 focus:ring-primary/40 dark:bg-gray-800 dark:border-gray-600 dark:text-gray-100"
>
{selectedOption ? selectedOption.label : <span className="text-gray-400 dark:text-gray-500">{placeholder}</span>}
</button>
{isOpen && (
<ul
id={listboxId}
role="listbox"
aria-label={label}
className="absolute z-50 mt-1 w-full max-h-60 overflow-auto rounded-lg border border-gray-200 bg-white shadow-lg dark:bg-gray-800 dark:border-gray-600"
>
{options.map((option) => {
const isActive = enabledOptions[activeIndex]?.value === option.value;
const isSelected = value === option.value;
return (
<li
key={option.value}
id={`${listboxId}-${option.value}`}
role="option"
aria-selected={isSelected}
aria-disabled={option.disabled}
onClick={() => !option.disabled && (onChange(option.value), setIsOpen(false))}
className={`px-3 py-2 cursor-pointer ${
option.disabled ? 'opacity-50 cursor-not-allowed' : ''
} ${isActive ? 'bg-primary/10 dark:bg-primary/20' : ''} ${isSelected ? 'font-semibold' : ''} dark:text-gray-200`}
>
{option.label}
</li>
);
})}
</ul>
)}
</div>
);
}
4.12 Checkbox & Switch
export interface CheckboxProps {
checked: boolean;
onChange: (checked: boolean) => void;
label: string;
disabled?: boolean;
id?: string;
}
function Checkbox({
checked, onChange, label, disabled = false, id
}: CheckboxProps) {
const generatedId = useId();
const inputId = id ?? generatedId;
return (
<div className="flex items-center gap-2">
<input
id={inputId}
type="checkbox"
checked={checked}
onChange={(e) => onChange(e.target.checked)}
disabled={disabled}
className="h-4 w-4 rounded border-gray-300 text-primary focus:ring-primary/40 accent-primary dark:border-gray-600"
/>
<label htmlFor={inputId} className={`text-sm ${disabled ? 'text-gray-400 dark:text-gray-600' : 'text-gray-700 dark:text-gray-300'}`}>
{label}
</label>
</div>
);
}
export interface SwitchProps {
checked: boolean;
onChange: (checked: boolean) => void;
label: string;
disabled?: boolean;
id?: string;
}
function Switch({
checked, onChange, label, disabled = false, id
}: SwitchProps) {
const generatedId = useId();
const switchId = id ?? generatedId;
return (
<div className="flex items-center gap-3">
<button
id={switchId}
role="switch"
aria-checked={checked}
aria-label={label}
disabled={disabled}
onClick={() => !disabled && onChange(!checked)}
className={`relative inline-flex h-6 w-11 shrink-0 cursor-pointer rounded-full border-2 border-transparent transition-colors duration-200 ease-in-out focus:outline-none focus:ring-2 focus:ring-primary/40 focus:ring-offset-2 dark:focus:ring-offset-gray-900 ${
checked ? 'bg-primary' : 'bg-gray-200 dark:bg-gray-700'
} ${disabled ? 'opacity-50 cursor-not-allowed' : ''}`}
>
<span
aria-hidden="true"
className={`pointer-events-none inline-block h-5 w-5 transform rounded-full bg-white shadow ring-0 transition duration-200 ease-in-out ${
checked ? 'translate-x-5' : 'translate-x-0'
}`}
/>
</button>
<label htmlFor={switchId} className={`text-sm ${disabled ? 'text-gray-400 dark:text-gray-600' : 'text-gray-700 dark:text-gray-300'}`}>
{label}
</label>
</div>
);
}
Fix: Changed from const inputId = id || useId() to const generatedId = useId(); const inputId = id ?? generatedId. The previous version called useId() conditionally — when id was provided, useId() would not be called due to short-circuit evaluation, violating React's Rules of Hooks. Now useId() is always called unconditionally.
4.13 Textarea with Character Count
export interface TextareaProps {
value: string;
onChange: (value: string) => void;
label: string;
maxLength?: number;
placeholder?: string;
required?: boolean;
error?: string;
id?: string;
}
function Textarea({
value, onChange, label, maxLength, placeholder, required = false, error, id
}: TextareaProps) {
const generatedId = useId();
const inputId = id ?? generatedId;
const errorId = `${inputId}-error`;
const countId = `${inputId}-count`;
return (
<div>
<label htmlFor={inputId} className="block text-sm font-medium text-gray-700 dark:text-gray-300 mb-1">
{label}
{required && <span aria-hidden="true" className="text-red-500 ml-1">*</span>}
</label>
<textarea
id={inputId}
value={value}
onChange={(e) => onChange(e.target.value)}
placeholder={placeholder}
maxLength={maxLength}
required={required}
aria-invalid={!!error}
aria-describedby={`${error ? errorId : ''} ${maxLength ? countId : ''}`.trim() || undefined}
aria-required={required}
className={`w-full rounded-lg border px-3 py-2 text-sm focus:outline-none focus:ring-2 focus:ring-primary/40 dark:bg-gray-800 dark:text-gray-100 ${
error ? 'border-red-500' : 'border-gray-300 dark:border-gray-600'
}`}
rows={4}
/>
<div className="flex justify-between mt-1">
{error && <p id={errorId} role="alert" className="text-sm text-red-600 dark:text-red-400">{error}</p>}
{maxLength && (
<p id={countId} className="text-xs text-gray-400 dark:text-gray-500 ml-auto" aria-live="polite">
{value.length}/{maxLength}
</p>
)}
</div>
</div>
);
}
4.14 Form with React Hook Form + Zod
'use client';
import { useForm } from 'react-hook-form';
import { zodResolver } from '@hookform/resolvers/zod';
import { z } from 'zod';
import { useId } from 'react';
const contactSchema = z.object({
name: z.string().min(2, 'Name must be at least 2 characters'),
email: z.string().email('Please enter a valid email'),
message: z.string().min(10, 'Message must be at least 10 characters').max(500, 'Message too long'),
subscribe: z.boolean().optional(),
});
type ContactForm = z.infer<typeof contactSchema>;
function ContactForm({ onSubmit }: { onSubmit: (data: ContactForm) => Promise<void> }) {
const {
register, handleSubmit, formState: { errors, isSubmitting }, reset
} = useForm<ContactForm>({
resolver: zodResolver(contactSchema),
});
const formId = useId();
const nameErrorId = `${formId}-name-error`;
const emailErrorId = `${formId}-email-error`;
const messageErrorId = `${formId}-message-error`;
const handleFormSubmit = async (data: ContactForm) => {
await onSubmit(data);
reset();
};
return (
<form onSubmit={handleSubmit(handleFormSubmit)} noValidate className="space-y-4">
<div>
<label className="block text-sm font-medium text-gray-700 dark:text-gray-300">
Name <span aria-hidden="true" className="text-red-500">*</span>
</label>
<input
type="text"
aria-invalid={!!errors.name}
aria-describedby={errors.name ? nameErrorId : undefined}
aria-required="true"
className={`w-full rounded-lg border px-3 py-2 text-sm focus:outline-none focus:ring-2 focus:ring-primary/40 dark:bg-gray-800 dark:text-gray-100 ${
errors.name ? 'border-red-500' : 'border-gray-300 dark:border-gray-600'
}`}
{...register('name')}
/>
{errors.name && <p id={nameErrorId} role="alert" className="mt-1 text-sm text-red-600 dark:text-red-400">{errors.name.message}</p>}
</div>
<div>
<label className="block text-sm font-medium text-gray-700 dark:text-gray-300">
Email <span aria-hidden="true" className="text-red-500">*</span>
</label>
<input
type="email"
aria-invalid={!!errors.email}
aria-describedby={errors.email ? emailErrorId : undefined}
aria-required="true"
className={`w-full rounded-lg border px-3 py-2 text-sm focus:outline-none focus:ring-2 focus:ring-primary/40 dark:bg-gray-800 dark:text-gray-100 ${
errors.email ? 'border-red-500' : 'border-gray-300 dark:border-gray-600'
}`}
{...register('email')}
/>
{errors.email && <p id={emailErrorId} role="alert" className="mt-1 text-sm text-red-600 dark:text-red-400">{errors.email.message}</p>}
</div>
<div>
<label className="block text-sm font-medium text-gray-700 dark:text-gray-300">
Message <span aria-hidden="true" className="text-red-500">*</span>
</label>
<textarea
rows={4}
aria-invalid={!!errors.message}
aria-describedby={errors.message ? messageErrorId : undefined}
aria-required="true"
className={`w-full rounded-lg border px-3 py-2 text-sm focus:outline-none focus:ring-2 focus:ring-primary/40 dark:bg-gray-800 dark:text-gray-100 ${
errors.message ? 'border-red-500' : 'border-gray-300 dark:border-gray-600'
}`}
{...register('message')}
/>
{errors.message && <p id={messageErrorId} role="alert" className="mt-1 text-sm text-red-600 dark:text-red-400">{errors.message.message}</p>}
</div>
<div className="flex items-center gap-2">
<input type="checkbox" className="h-4 w-4 rounded accent-primary" {...register('subscribe')} />
<label className="text-sm text-gray-700 dark:text-gray-300">Subscribe to newsletter</label>
</div>
<button
type="submit"
disabled={isSubmitting}
className="px-4 py-2 rounded-lg bg-primary text-white hover:bg-primary-hover focus:outline-none focus:ring-2 focus:ring-primary/40 focus:ring-offset-2 dark:focus:ring-offset-gray-900 disabled:opacity-50 disabled:cursor-not-allowed transition-colors"
>
{isSubmitting ? 'Sending...' : 'Send Message'}
</button>
</form>
);
}
Fix: Error IDs now use useId() prefix (${formId}-name-error, etc.) to guarantee uniqueness across multiple form instances on the same page. Previously hardcoded IDs (name-error, email-error, message-error) would duplicate when rendering multiple forms.
4.15 Toast with CSS Progress Animation
Use CSS @keyframes for the progress bar animation instead of setInterval for better performance. Multiple toasts stack vertically, each with configurable duration, auto-dismiss, and a close button.
'use client';
import { useState, useCallback, useRef } from 'react';
export interface Toast {
id: string;
message: string;
variant: 'success' | 'error' | 'warning' | 'info';
duration?: number;
}
let toastCounter = 0;
function ToastContainer({ toasts, onDismiss }: {
toasts: Toast[];
onDismiss: (id: string) => void;
}) {
return (
<div
aria-live="polite"
aria-label="Notifications"
className="fixed bottom-4 right-4 z-[var(--z-toast)] flex flex-col gap-2"
>
{toasts.map((toast) => (
<ToastItem key={toast.id} toast={toast} onDismiss={onDismiss} />
))}
</div>
);
}
function ToastItem({ toast, onDismiss }: { toast: Toast; onDismiss: (id: string) => void }) {
const variantStyles = {
success: 'bg-green-600 dark:bg-green-700',
error: 'bg-red-600 dark:bg-red-700',
warning: 'bg-amber-500 dark:bg-amber-600',
info: 'bg-blue-600 dark:bg-blue-700',
};
const duration = toast.duration || 5000;
return (
<div
role="status"
className={`relative overflow-hidden rounded-lg text-white shadow-lg animate-toast-in ${variantStyles[toast.variant]}`}
style={{ minWidth: '300px' }}
>
<div className="flex items-center justify-between px-4 py-3">
<p className="text-sm font-medium">{toast.message}</p>
<button
onClick={() => onDismiss(toast.id)}
className="ml-3 text-white/80 hover:text-white"
aria-label="Dismiss notification"
>
<svg className="w-4 h-4" fill="currentColor" viewBox="0 0 20 20" aria-hidden="true">
<path fillRule="evenodd" d="M4.293 4.293a1 1 0 011.414 0L10 8.586l4.293-4.293a1 1 0 111.414 1.414L11.414 10l4.293 4.293a1 1 0 01-1.414 1.414L10 11.414l-4.293 4.293a1 1 0 01-1.414-1.414L8.586 10 4.293 5.707a1 1 0 010-1.414z" clipRule="evenodd" />
</svg>
</button>
</div>
<div
className="h-1 bg-white/30"
style={{
animation: `toast-progress ${duration}ms linear forwards`,
}}
onAnimationEnd={() => onDismiss(toast.id)}
/>
<style>{`
@keyframes toast-progress {
from { width: 100%; }
to { width: 0%; }
}
@keyframes toast-in {
from { opacity: 0; transform: translateX(100%); }
to { opacity: 1; transform: translateX(0); }
}
.animate-toast-in {
animation: toast-in 0.3s ease-out;
}
`}</style>
</div>
);
}
function useToast() {
const [toasts, setToasts] = useState<Toast[]>([]);
const counterRef = useRef(0);
const addToast = useCallback((message: string, variant: Toast['variant'] = 'info', duration?: number) => {
const id = `toast-${++counterRef.current}`;
setToasts(prev => [...prev, { id, message, variant, duration }]);
return id;
}, []);
const dismissToast = useCallback((id: string) => {
setToasts(prev => prev.filter(t => t.id !== id));
}, []);
return { toasts, addToast, dismissToast };
}
Fix: Replaced Math.random().toString(36).slice(2) with a module-level counter (toastCounter) and useRef-based counter. Math.random() produces non-deterministic values that violate SSR consistency and the skill's own anti-pattern #1.
4.16 Navigation Bar
'use client';
import { useState, useCallback, useRef, useId } from 'react';
export interface NavItem {
label: string;
href: string;
active?: boolean;
}
function Navbar({ brand, items, actions }: {
brand: { label: string; href: string };
items: NavItem[];
actions?: React.ReactNode;
}) {
const [isMobileOpen, setIsMobileOpen] = useState(false);
const menuId = useId();
const mobileMenuRef = useRef<HTMLDivElement>(null);
return (
<nav aria-label="Main navigation" className="sticky top-0 z-[var(--z-sticky)] bg-white dark:bg-gray-900 border-b dark:border-gray-700">
<div className="max-w-7xl mx-auto px-4 sm:px-6 lg:px-8">
<div className="flex items-center justify-between h-16">
<a href={brand.href} className="text-lg font-bold text-gray-900 dark:text-white">
{brand.label}
</a>
<div className="hidden md:flex md:items-center md:gap-1">
{items.map((item) => (
<a
key={item.href}
href={item.href}
className={`px-3 py-2 rounded-md text-sm font-medium transition-colors ${
item.active
? 'bg-primary/10 text-primary dark:bg-primary/20 dark:text-primary'
: 'text-gray-600 hover:bg-gray-100 hover:text-gray-900 dark:text-gray-300 dark:hover:bg-gray-800 dark:hover:text-white'
}`}
aria-current={item.active ? 'page' : undefined}
>
{item.label}
</a>
))}
</div>
<div className="hidden md:flex md:items-center md:gap-2">
{actions}
</div>
<button
className="md:hidden p-2 rounded-md text-gray-600 hover:bg-gray-100 hover:text-gray-900 focus:outline-none focus:ring-2 focus:ring-primary/40 dark:text-gray-300 dark:hover:bg-gray-800"
onClick={() => setIsMobileOpen(prev => !prev)}
aria-expanded={isMobileOpen}
aria-controls={menuId}
aria-label={isMobileOpen ? 'Close menu' : 'Open menu'}
>
<svg className="w-6 h-6" fill="none" viewBox="0 0 24 24" stroke="currentColor" aria-hidden="true">
{isMobileOpen ? (
<path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M6 18L18 6M6 6l12 12" />
) : (
<path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M4 6h16M4 12h16M4 18h16" />
)}
</svg>
</button>
</div>
</div>
{isMobileOpen && (
<div
id={menuId}
ref={mobileMenuRef}
className="md:hidden border-t bg-white dark:bg-gray-900 dark:border-gray-700"
role="region"
aria-label="Mobile navigation"
>
<div className="px-4 py-3 space-y-1">
{items.map((item) => (
<a
key={item.href}
href={item.href}
className={`block px-3 py-2 rounded-md text-base font-medium transition-colors ${
item.active
? 'bg-primary/10 text-primary dark:bg-primary/20 dark:text-primary'
: 'text-gray-600 hover:bg-gray-100 hover:text-gray-900 dark:text-gray-300 dark:hover:bg-gray-800 dark:hover:text-white'
}`}
aria-current={item.active ? 'page' : undefined}
onClick={() => setIsMobileOpen(false)}
>
{item.label}
</a>
))}
</div>
{actions && <div className="px-4 py-3 border-t dark:border-gray-700">{actions}</div>}
</div>
)}
</nav>
);
}
4.17 Breadcrumb
export interface BreadcrumbItem {
label: string;
href?: string;
}
function Breadcrumb({ items }: { items: BreadcrumbItem[] }) {
return (
<nav aria-label="Breadcrumb">
<ol className="flex items-center gap-1 text-sm dark:text-gray-400" itemScope itemType="https://schema.org/BreadcrumbList">
{items.map((item, index) => {
const isLast = index === items.length - 1;
return (
<li
key={index}
className="flex items-center gap-1"
itemProp="itemListElement"
itemScope
itemType="https://schema.org/ListItem"
>
{index > 0 && (
<span aria-hidden="true" className="text-gray-400 dark:text-gray-600">/</span>
)}
{isLast || !item.href ? (
<span
className="text-gray-500 dark:text-gray-400 font-medium"
aria-current="page"
itemProp="name"
>
{item.label}
</span>
) : (
<a
href={item.href}
className="text-primary hover:underline dark:text-primary-light"
itemProp="item"
>
<span itemProp="name">{item.label}</span>
</a>
)}
<meta itemProp="position" content={String(index + 1)} />
</li>
);
})}
</ol>
</nav>
);
}
4.18 Tooltip
'use client';
import { useState, useRef, useId, useEffect } from 'react';
export interface TooltipProps {
children: React.ReactElement;
content: string;
side?: 'top' | 'bottom' | 'left' | 'right';
}
function Tooltip({ children, content, side = 'top' }: TooltipProps) {
const [isVisible, setIsVisible] = useState(false);
const [position, setPosition] = useState<{ top: number; left: number }>({ top: 0, left: 0 });
const triggerRef = useRef<HTMLElement>(null);
const tooltipId = useId();
const timeoutRef = useRef<NodeJS.Timeout>();
useEffect(() => {
return () => {
if (timeoutRef.current) clearTimeout(timeoutRef.current);
};
}, []);
const show = () => {
timeoutRef.current = setTimeout(() => {
if (triggerRef.current) {
const rect = triggerRef.current.getBoundingClientRect();
const positions = {
top: { top: rect.top - 8, left: rect.left + rect.width / 2 },
bottom: { top: rect.bottom + 8, left: rect.left + rect.width / 2 },
left: { top: rect.top + rect.height / 2, left: rect.left - 8 },
right: { top: rect.top + rect.height / 2, left: rect.right + 8 },
};
setPosition(positions[side]);
}
setIsVisible(true);
}, 300);
};
const hide = () => {
if (timeoutRef.current) clearTimeout(timeoutRef.current);
setIsVisible(false);
};
return (
<>
{isVisible && (
<div
id={tooltipId}
role="tooltip"
className="fixed z-[var(--z-tooltip)] px-2 py-1 text-xs font-medium text-white bg-gray-900 dark:bg-gray-700 rounded shadow-lg pointer-events-none animate-fade-in"
style={{
top: position.top,
left: position.left,
transform: side === 'top' ? 'translate(-50%, -100%)' :
side === 'bottom' ? 'translate(-50%, 0)' :
side === 'left' ? 'translate(-100%, -50%)' :
'translate(0, -50%)',
}}
>
{content}
</div>
)}
{typeof children.type === 'string' ? (
<children.type
{...children.props}
ref={triggerRef}
aria-describedby={isVisible ? tooltipId : undefined}
onMouseEnter={show}
onMouseLeave={hide}
onFocus={show}
onBlur={hide}
/>
) : (
<span
ref={triggerRef as React.RefObject<HTMLSpanElement>}
aria-describedby={isVisible ? tooltipId : undefined}
onMouseEnter={show}
onMouseLeave={hide}
onFocus={show}
onBlur={hide}
>
{children}
</span>
)}
</>
);
}
Fix: Added useEffect cleanup for timeoutRef. Without cleanup, if the Tooltip component unmounts while a timeout is pending, the callback will try to update state on an unmounted component, causing a React warning and potential memory leak.
4.19 Password Input
'use client';
import { useState, useCallback, useId } from 'react';
export interface PasswordInputProps {
value: string;
onChange: (value: string) => void;
label: string;
error?: string;
required?: boolean;
id?: string;
}
function PasswordInput({ value, onChange, label, error, required = false, id }: PasswordInputProps) {
const [showPassword, setShowPassword] = useState(false);
const generatedId = useId();
const inputId = id ?? generatedId;
const errorId = `${inputId}-error`;
const strengthId = `${inputId}-strength`;
const getStrength = useCallback((pwd: string): { label: string; color: string; width: string } => {
if (pwd.length === 0) return { label: '', color: '', width: '0%' };
if (pwd.length < 6) return { label: 'Weak', color: 'bg-red-500', width: '25%' };
if (pwd.length < 10) return { label: 'Fair', color: 'bg-amber-500', width: '50%' };
if (/[A-Z]/.test(pwd) && /[0-9]/.test(pwd) && /[^A-Za-z0-9]/.test(pwd)) {
return { label: 'Strong', color: 'bg-green-500', width: '100%' };
}
return { label: 'Good', color: 'bg-blue-500', width: '75%' };
}, []);
const strength = getStrength(value);
return (
<div>
<label htmlFor={inputId} className="block text-sm font-medium text-gray-700 dark:text-gray-300 mb-1">
{label}
{required && <span aria-hidden="true" className="text-red-500 ml-1">*</span>}
</label>
<div className="relative">
<input
id={inputId}
type={showPassword ? 'text' : 'password'}
value={value}
onChange={(e) => onChange(e.target.value)}
required={required}
aria-invalid={!!error}
aria-describedby={`${error ? errorId : ''} ${value ? strengthId : ''}`.trim() || undefined}
className="w-full rounded-lg border px-3 py-2 pr-10 text-sm focus:outline-none focus:ring-2 focus:ring-primary/40 dark:bg-gray-800 dark:text-gray-100 dark:border-gray-600"
/>
<button
type="button"
onClick={() => setShowPassword(prev => !prev)}
className="absolute right-2 top-1/2 -translate-y-1/2 p-1 text-gray-400 hover:text-gray-600 dark:hover:text-gray-300"
aria-label={showPassword ? 'Hide password' : 'Show password'}
>
{showPassword ? (
<svg className="w-5 h-5" fill="none" viewBox="0 0 24 24" stroke="currentColor" aria-hidden="true">
<path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M13.875 18.825A10.05 10.05 0 0112 19c-4.478 0-8.268-2.943-9.543-7a9.97 9.97 0 011.563-3.029m5.858.908a3 3 0 114.243 4.243M9.878 9.878l4.242 4.242M9.88 9.88l-3.29-3.29m7.532 7.532l3.29 3.29M3 3l3.59 3.59m0 0A9.953 9.953 0 0112 5c4.478 0 8.268 2.943 9.543 7a10.025 10.025 0 01-4.132 5.411m0 0L21 21" />
</svg>
) : (
<svg className="w-5 h-5" fill="none" viewBox="0 0 24 24" stroke="currentColor" aria-hidden="true">
<path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M15 12a3 3 0 11-6 0 3 3 0 016 0z" />
<path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M2.458 12C3.732 7.943 7.523 5 12 5c4.478 0 8.268 2.943 9.542 7-1.274 4.057-5.064 7-9.542 7-4.477 0-8.268-2.943-9.542-7z" />
</svg>
)}
</button>
</div>
{value && (
<div className="mt-1 flex items-center gap-2" aria-live="polite" id={strengthId}>
<div className="flex-1 h-1 bg-gray-200 dark:bg-gray-700 rounded-full overflow-hidden">
<div className={`h-full rounded-full transition-all duration-300 ${strength.color}`} style={{ width: strength.width }} />
</div>
<span className="text-xs text-gray-500 dark:text-gray-400">{strength.label}</span>
</div>
)}
{error && <p id={errorId} role="alert" className="mt-1 text-sm text-red-600 dark:text-red-400">{error}</p>}
</div>
);
}
Fixes: (1) Changed const inputId = id || useId() to always call useId unconditionally with id ?? generatedId. (2) Added aria-live="polite" and id={strengthId} to the strength indicator container so screen readers announce strength changes. (3) Updated aria-describedby to include the strength ID.
4.20 Radio Group
'use client';
import { useState, useCallback, useId } from 'react';
export interface RadioOption {
value: string;
label: string;
disabled?: boolean;
description?: string;
}
export interface RadioGroupProps {
options: RadioOption[];
value?: string;
onChange: (value: string) => void;
label: string;
error?: string;
}
function RadioGroup({ options, value, onChange, label, error }: RadioGroupProps) {
const groupId = useId();
const [focusedIndex, setFocusedIndex] = useState(-1);
const enabledOptions = options.filter(o => !o.disabled);
const handleKeyDown = useCallback((e: React.KeyboardEvent) => {
const currentIdx = enabledOptions.findIndex(o => o.value === value);
let nextIdx = currentIdx;
switch (e.key) {
case 'ArrowDown':
case 'ArrowRight':
e.preventDefault();
nextIdx = (currentIdx + 1) % enabledOptions.length;
break;
case 'ArrowUp':
case 'ArrowLeft':
e.preventDefault();
nextIdx = (currentIdx - 1 + enabledOptions.length) % enabledOptions.length;
break;
default:
return;
}
const next = enabledOptions[nextIdx];
onChange(next.value);
setFocusedIndex(nextIdx);
document.getElementById(`${groupId}-${next.value}`)?.focus();
}, [enabledOptions, value, onChange, groupId]);
return (
<fieldset>
<legend className="text-sm font-medium text-gray-700 dark:text-gray-300">{label}</legend>
<div
onKeyDown={handleKeyDown}
className="mt-2 space-y-2"
>
{options.map((option) => {
const isSelected = value === option.value;
return (
<label
key={option.value}
className={`flex items-start gap-3 p-3 rounded-lg border cursor-pointer transition-colors ${
isSelected ? 'border-primary bg-primary/5 dark:border-primary dark:bg-primary/10' : 'border-gray-200 hover:border-gray-300 dark:border-gray-700 dark:hover:border-gray-600'
} ${option.disabled ? 'opacity-50 cursor-not-allowed' : ''}`}
>
<input
id={`${groupId}-${option.value}`}
type="radio"
name={groupId}
value={option.value}
checked={isSelected}
onChange={() => !option.disabled && onChange(option.value)}
disabled={option.disabled}
className="mt-0.5 h-4 w-4 text-primary focus:ring-primary/40 accent-primary"
/>
<div>
<span className="text-sm font-medium text-gray-900 dark:text-gray-100">{option.label}</span>
{option.description && (
<p className="text-xs text-gray-500 dark:text-gray-400 mt-0.5">{option.description}</p>
)}
</div>
</label>
);
})}
</div>
{error && <p role="alert" className="mt-1 text-sm text-red-600 dark:text-red-400">{error}</p>}
</fieldset>
);
}
Fix: Removed redundant role="radiogroup" from the inner <div>. The <fieldset> + <legend> already provides the semantic grouping and accessible name for the radio options. Adding role="radiogroup" alongside <fieldset> creates redundant ARIA that can confuse screen readers.
4.21 Data Table
'use client';
import { useState, useMemo } from 'react';
export interface Column<T> {
key: keyof T;
label: string;
sortable?: boolean;
render?: (value: T[keyof T], row: T) => React.ReactNode;
}
export interface DataTableProps<T extends Record<string, unknown>> {
data: T[];
columns: Column<T>[];
caption?: string;
onRowClick?: (row: T) => void;
ref?: React.Ref<HTMLDivElement>;
}
function DataTable<T extends Record<string, unknown>>({
data, columns, caption, onRowClick, ref
}: DataTableProps<T>) {
const [sortKey, setSortKey] = useState<keyof T | null>(null);
const [sortDir, setSortDir] = useState<'asc' | 'desc'>('asc');
const sortedData = useMemo(() => {
if (!sortKey) return data;
return [...data].sort((a, b) => {
const aVal = a[sortKey];
const bVal = b[sortKey];
if (aVal == null || bVal == null) return 0;
const cmp = String(aVal).localeCompare(String(bVal), undefined, { numeric: true });
return sortDir === 'asc' ? cmp : -cmp;
});
}, [data, sortKey, sortDir]);
const handleSort = (key: keyof T) => {
if (sortKey === key) {
setSortDir(prev => prev === 'asc' ? 'desc' : 'asc');
} else {
setSortKey(key);
setSortDir('asc');
}
};
return (
<div ref={ref} className="overflow-x-auto rounded-lg border dark:border-gray-700">
<table className="w-full text-sm">
{caption && <caption className="sr-only">{caption}</caption>}
<thead>
<tr className="bg-gray-50 dark:bg-gray-800 border-b dark:border-gray-700">
{columns.map((col) => (
<th
key={String(col.key)}
scope="col"
className="px-4 py-3 text-left font-medium text-gray-700 dark:text-gray-300"
>
{col.sortable ? (
<button
onClick={() => handleSort(col.key)}
className="flex items-center gap-1 hover:text-gray-900 dark:hover:text-white transition-colors"
aria-sort={sortKey === col.key ? (sortDir === 'asc' ? 'ascending' : 'descending') : 'none'}
>
{col.label}
<span aria-hidden="true" className="text-xs">
{sortKey === col.key ? (sortDir === 'asc' ? '^' : 'v') : '^v'}
</span>
</button>
) : (
col.label
)}
</th>
))}
</tr>
</thead>
<tbody>
{sortedData.map((row, i) => (
<tr
key={i}
className={`border-b hover:bg-gray-50 dark:border-gray-700 dark:hover:bg-gray-800 transition-colors ${
onRowClick ? 'cursor-pointer' : ''
}`}
onClick={() => onRowClick?.(row)}
style={{ contentVisibility: 'auto', containIntrinsicSize: 'auto 48px' }}
>
{columns.map((col) => (
<td key={String(col.key)} className="px-4 py-3 dark:text-gray-300">
{col.render ? col.render(row[col.key], row) : String(row[col.key] ?? '')}
</td>
))}
</tr>
))}
</tbody>
</table>
</div>
);
}
Fix: Replaced useCallback(() => { ... }, deps)() (useCallback + IIFE) with useMemo(() => { ... }, deps). The previous pattern called a memoized callback on every render, defeating the purpose of memoization. useMemo correctly caches the computed sorted data.
4.22 Pagination
'use client';
import { useCallback } from 'react';
export interface PaginationProps {
currentPage: number;
totalPages: number;
onPageChange: (page: number) => void;
}
function Pagination({ currentPage, totalPages, onPageChange }: PaginationProps) {
const getPageNumbers = useCallback(() => {
const pages: (number | '...')[] = [];
if (totalPages <= 7) {
for (let i = 1; i <= totalPages; i++) pages.push(i);
} else {
pages.push(1);
if (currentPage > 3) pages.push('...');
const start = Math.max(2, currentPage - 1);
const end = Math.min(totalPages - 1, currentPage + 1);
for (let i = start; i <= end; i++) pages.push(i);
if (currentPage < totalPages - 2) pages.push('...');
pages.push(totalPages);
}
return pages;
}, [currentPage, totalPages]);
return (
<nav aria-label="Pagination" className="flex items-center gap-1">
<button
onClick={() => onPageChange(currentPage - 1)}
disabled={currentPage <= 1}
className="px-3 py-2 rounded-md text-sm disabled:opacity-50 disabled:cursor-not-allowed hover:bg-gray-100 dark:hover:bg-gray-800 dark:text-gray-300 transition-colors"
aria-label="Previous page"
>
Previous
</button>
{getPageNumbers().map((page, i) =>
page === '...' ? (
<span key={`ellipsis-${i}`} className="px-2 text-gray-400 dark:text-gray-600" aria-hidden="true">...</span>
) : (
<button
key={page}
onClick={() => onPageChange(page)}
className={`px-3 py-2 rounded-md text-sm transition-colors ${
currentPage === page
? 'bg-primary text-white font-medium'
: 'hover:bg-gray-100 text-gray-700 dark:hover:bg-gray-800 dark:text-gray-300'
}`}
aria-label={`Page ${page}`}
aria-current={currentPage === page ? 'page' : undefined}
>
{page}
</button>
)
)}
<button
onClick={() => onPageChange(currentPage + 1)}
disabled={currentPage >= totalPages}
className="px-3 py-2 rounded-md text-sm disabled:opacity-50 disabled:cursor-not-allowed hover:bg-gray-100 dark:hover:bg-gray-800 dark:text-gray-300 transition-colors"
aria-label="Next page"
>
Next
</button>
</nav>
);
}
4.23 Drawer / Sheet
A slide-in panel anchored to the edge of the viewport. Uses the native <dialog> element for built-in focus management and backdrop, combined with CSS @starting-style for entry/exit animation.
'use client';
import { useRef, useEffect, useCallback, useId } from 'react';
export interface DrawerProps {
isOpen: boolean;
onClose: () => void;
title: string;
description?: string;
children: React.ReactNode;
side?: 'left' | 'right' | 'top' | 'bottom';
ref?: React.Ref<HTMLDialogElement>;
}
function Drawer({ isOpen, onClose, title, description, children, side = 'right', ref }: DrawerProps) {
const dialogRef = useRef<HTMLDialogElement>(null);
const setDialogRef = useCallback((node: HTMLDialogElement | null) => {
(dialogRef as React.MutableRefObject<HTMLDialogElement | null>).current = node;
if (typeof ref === 'function') ref(node);
else if (ref) (ref as React.MutableRefObject<HTMLDialogElement | null>).current = node;
}, [ref]);
const previousFocusRef = useRef<HTMLElement | null>(null);
const titleId = useId();
const descId = useId();
useEffect(() => {
const dialog = dialogRef.current;
if (!dialog) return;
if (isOpen) {
previousFocusRef.current = document.activeElement as HTMLElement;
dialog.showModal();
} else {
if (dialog.open) {
dialog.close();
}
previousFocusRef.current?.focus();
}
}, [isOpen]);
const handleKeyDown = useCallback((e: React.KeyboardEvent) => {
if (e.key === 'Escape') {
e.preventDefault();
onClose();
return;
}
if (e.key !== 'Tab') return;
const dialog = dialogRef.current;
if (!dialog) return;
const focusable = dialog.querySelectorAll<HTMLElement>(
'a[href], button:not([disabled]), textarea, input, select, [tabindex]:not([tabindex="-1"])'
);
const first = focusable[0];
const last = focusable[focusable.length - 1];
if (e.shiftKey && document.activeElement === first) {
e.preventDefault();
last?.focus();
} else if (!e.shiftKey && document.activeElement === last) {
e.preventDefault();
first?.focus();
}
}, [onClose]);
const sideClasses = {
right: 'right-0 top-0 bottom-0 w-full max-w-md translate-x-full data-[open]:translate-x-0',
left: 'left-0 top-0 bottom-0 w-full max-w-md -translate-x-full data-[open]:translate-x-0',
top: 'top-0 left-0 right-0 h-full max-h-md translate-y-full data-[open]:translate-y-0',
bottom: 'bottom-0 left-0 right-0 h-full max-h-md -translate-y-full data-[open]:translate-y-0',
};
return (
<dialog
ref={setDialogRef}
onClose={onClose}
onKeyDown={handleKeyDown}
aria-labelledby={titleId}
aria-describedby={description ? descId : undefined}
className="m-0 p-0 bg-transparent backdrop:bg-black/50 backdrop:backdrop-blur-sm overflow-visible"
>
<div
className={`fixed ${sideClasses[side]} bg-white dark:bg-gray-900 shadow-2xl flex flex-col transition-transform duration-300 ease-out`}
>
<div className="flex items-center justify-between p-4 border-b border-gray-200 dark:border-gray-700">
<div>
<h2 id={titleId} className="text-lg font-semibold dark:text-gray-100">{title}</h2>
{description && (
<p id={descId} className="text-sm text-gray-500 dark:text-gray-400 mt-1">{description}</p>
)}
</div>
<button
onClick={onClose}
className="p-2 rounded-lg hover:bg-gray-100 dark:hover:bg-gray-800 dark:text-gray-300 transition-colors"
aria-label="Close drawer"
>
<svg className="w-5 h-5" fill="currentColor" viewBox="0 0 20 20" aria-hidden="true">
<path fillRule="evenodd" d="M4.293 4.293a1 1 0 011.414 0L10 8.586l4.293-4.293a1 1 0 111.414 1.414L11.414 10l4.293 4.293a1 1 0 01-1.414 1.414L10 11.414l-4.293 4.293a1 1 0 01-1.414-1.414L8.586 10 4.293 5.707a1 1 0 010-1.414z" clipRule="evenodd" />
</svg>
</button>
</div>
<div className="flex-1 overflow-y-auto p-4 dark:text-gray-300">
{children}
</div>
</div>
</dialog>
);
}
4.24 Avatar
Display user profile images with fallback initials. Supports multiple sizes and a status indicator.
export interface AvatarProps {
src?: string;
alt?: string;
name?: string;
size?: 'sm' | 'md' | 'lg' | 'xl';
status?: 'online' | 'offline' | 'away' | 'busy';
ref?: React.Ref<HTMLDivElement>;
}
function Avatar({ src, alt, name, size = 'md', status, ref }: AvatarProps) {
const sizeClasses = {
sm: 'w-8 h-8 text-xs',
md: 'w-10 h-10 text-sm',
lg: 'w-12 h-12 text-base',
xl: 'w-16 h-16 text-lg',
};
const statusSizeClasses = {
sm: 'w-2 h-2',
md: 'w-2.5 h-2.5',
lg: 'w-3 h-3',
xl: 'w-4 h-4',
};
const statusColors = {
online: 'bg-green-500',
offline: 'bg-gray-400 dark:bg-gray-500',
away: 'bg-amber-500',
busy: 'bg-red-500',
};
const initials = name
? name.split(' ').map(w => w[0]).join('').toUpperCase().slice(0, 2)
: '?';
return (
<div ref={ref} className="relative inline-flex" role="img" aria-label={alt || name || 'User avatar'}>
{src ? (
<img
src={src}
alt={alt || name || 'User avatar'}
className={`${sizeClasses[size]} rounded-full object-cover ring-2 ring-white dark:ring-gray-800`}
/>
) : (
<div
className={`${sizeClasses[size]} rounded-full flex items-center justify-center font-medium bg-gray-200 dark:bg-gray-700 text-gray-600 dark:text-gray-300 ring-2 ring-white dark:ring-gray-800`}
aria-hidden="true"
>
{initials}
</div>
)}
{status && (
<span
className={`absolute bottom-0 right-0 ${statusSizeClasses[size]} ${statusColors[status]} rounded-full ring-2 ring-white dark:ring-gray-800`}
aria-label={`Status: ${status}`}
>
<span className="sr-only">{status}</span>
</span>
)}
</div>
);
}
4.25 Command Palette
A keyboard-activated search-and-execute palette (Cmd+K / Ctrl+K). Follows the WAI-ARIA combobox pattern with a filtered list of commands.
'use client';
import { useState, useRef, useCallback, useEffect, useId } from 'react';
