Use when verifying a mobile (Expo / React Native) change on a real device — "test on the emulator", "run it on the simulator", "screenshot the app", "drive it with Maestro", "does this screen render", "check it on Android/iOS", "tap through the app", "is the animation right" — or when a local iOS/Android build + TestFlight/Play ship needs driving. Covers the device-driving loop (deep links, Maestro flows, screenshots, sips crops) AND the gotchas that actually bite — Maestro ASCII-only input, non-login-shell pod builds, Metro `--clear` redbox desync, native-needs-rebuild, SceneKit magenta-at-runtime, square particles, apple-targets widget/App-Clip extension creds + App Group capability, stale Android autolinking package, low-disk local-build ENOSPC, native dep/ABI skew → dyld symbol-missing launch crash, Maestro `launchApp` resuming the last screen. NOT for writing the app code (normal edits) or authoring corgi-compose (corgi skill).
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Use when verifying a mobile (Expo / React Native) change on a real device — "test on the emulator", "run it on the simulator", "screenshot the app", "drive it with Maestro", "does this screen render", "check it on Android/iOS", "tap through the app", "is the animation right" — or when a local iOS/Android build + TestFlight/Play ship needs driving. Covers the device-driving loop (deep links, Maestro flows, screenshots, sips crops) AND the gotchas that actually bite — Maestro ASCII-only input, non-login-shell pod builds, Metro `--clear` redbox desync, native-needs-rebuild, SceneKit magenta-at-runtime, square particles, apple-targets widget/App-Clip extension creds + App Group capability, stale Android autolinking package, low-disk local-build ENOSPC, native dep/ABI skew → dyld symbol-missing launch crash, Maestro `launchApp` resuming the last screen. NOT for writing the app code (normal edits) or authoring corgi-compose (corgi skill).
metadata
{"author":"Andriiklymiuk"}
Verify mobile change on device
Overview
Change NOT done till you DROVE on device + READ screenshot. Green build still render
magenta. Pick surface → navigate → drive+assert Maestro → screenshot → look. Evidence
before "works".
Pick surface first
JS / TS / Skia / RN styles / shaders → hot-reload over Metro. Use Android
emulator — fastest, no rebuild. Edit, save, live.
Native (Swift / Kotlin / SceneKit / new native dep / config plugin) → NO hot-reload.
Rebuild (expo run:ios / expo run:android) to see. JS reload won't.
One Metro serves both Android + iOS; expo run:* reuses a running one.
Fast ≠ representative — a JS/style edit still renders DIFFERENTLY iOS↔Android. Absolute
positioning, overflow/clipping, font metrics, shadows and safe-area diverge per platform
(this is exactly how an Android-only run ships an iOS-only clip / mis-centre / cut-off).
The Android emulator is the fast inner loop; for any shape- or layout-sensitive change,
spot-check the SAME screen on the iOS sim before you trust it or ship — don't conclude
from one platform.
Drive loop
Navigate — deep link beats menu-tapping:
Android adb shell am start -a android.intent.action.VIEW -d "<scheme>://<route>" <pkg>
Drive+assert Maestro — flow MUST be a FILE (no stdin -). Two devices attached
(emulator + sim) → pass --device <udid | emulator-5554>. Tools: tapOn: text or
point: "50%,40%", scrollUntilVisible, waitForAnimationToEnd, takeScreenshot.
READ it. Never assert "renders fine" on a frame you didn't open.
Geometry bug? MEASURE, don't eyeball. A wrong shape (circle gone square,
clipped / oval disc, mis-aligned pill, off-centre number) is INVISIBLE at
full-frame scale — confirm it by the node's real box, not by squinting:
Android: adb shell uiautomator dump /sdcard/u.xml && adb pull /sdcard/u.xml .,
then grep content-desc="…" …bounds="[x1,y1][x2,y2]" — x2-x1 / y2-y1 is
the true px size (a square where you want a circle, or a cell far larger than
its disc, is the tell).
Re-toggle the state and re-measure: a bug that only shows AFTER a state change
(a freshly-toggled day) won't appear on first paint.
Mutating action? Confirm it PERSISTED. After a tap that writes state (toggle a
day, save a value), re-open the screen — or a DIFFERENT view of the same data — and
check the change is still there. The optimistic first frame can lie; the round-trip
through the store is the proof it actually wrote.
Setting that drives output? CHANGE it and watch the value RECOMPUTE. Don't just
confirm a setting saved — change it and verify every dependent screen moves (the
countdown, the prediction, the badge, the chart). If the setting "saves" but the output
doesn't budge, a DERIVED value is overriding it — a history/auto average, a cached
default, something computed from the data instead of from the setting. That silent
override (the setting only applied) is a common, screenshot-invisible bug, and
the on-device before/after is the only proof. The fix is usually to make the screen read
the setting directly and surface the computed value as a , not an override.
Gotchas (each bit a real session)
Maestro inputText ASCII-only — no Cyrillic / non-Latin. Use ASCII query, or text
via adb. Prove cross-locale: type a Latin word matching only via another locale's
string.
A fixed-coordinate tap on a CTA misses after the screen reflows. Tapping a remembered
(x,y) for "Start" / "Submit" / "Continue" lands on the WRONG control once selecting an
option REMOVED a line above it (a "need ≥2 players" warning clears, a validation row
disappears) — the button shifted UP, your tap hits whatever is now there (often a
destructive "Leave" / "Cancel" below it), and the flow silently resets. Re-read the
node's REAL bounds AFTER the state change (uiautomator dump + grep the text= bounds,
or Maestro tapOn: by text), never reuse pre-change coordinates across a mutating tap.
Local iOS build MUST be a NON-LOGIN shell — which then MUST re-export LANG.nohup bash -c 'export LANG=en_US.UTF-8 LC_ALL=en_US.UTF-8; …; make <prod-target>' — NOT
bash -lc. Login profile puts a broken Ruby on PATH → pod install dies with a
misleading visionos CocoaPods error at prebuild. BUT non-login shell drops the
profile's locale → without the explicit LANG, pod install dies with
Encoding::CompatibilityError ("CocoaPods requires UTF-8"). Need BOTH. It bites
again one level down:eas build --local runs its OWN nested prebuild + pod install that inherits the PARENT shell's env — so a Makefile that sets LANGinline on its prebuild step is necessary but NOT sufficient; the ambient shell must
export LANG/LC_ALL too, or EAS's internal pod install dies the same way while the
Makefile's own one succeeded (a baffling "pods worked, then the build failed on pods").
Long builds → background + poll log.nohup … > build/log 2>&1 &, then poll:
until grep -qiE "BUILD SUCCEEDED|BUILD FAILED|Submitting|successfully uploaded|error:" build/log; do sleep 20; done.
The nohup … & WRAPPER returns instantly — a task-runner marks THAT "complete" the
moment it backgrounds, so there is no completion event for the real build; never
wait for a done signal, poll the log for milestones. No foreground tool for 20 min.
Local iOS archive needs GBs of free disk — FIRST. A local prod build writes
DerivedData + an archive + the IPA (10 GB+). Run low mid-build and / the
archive dies with an ENOSPC or a generic install failure — NOT a clear "disk full."
Reclaim before launching: , old
, stale .
A widget / App Clip / share extension via @bacons/apple-targets is a SECOND signed
target — own bundle id, profile, capabilities. Each bites once:
First build needs a ONE-TIME INTERACTIVE eas credential sync. The non-login
--non-interactive prod build can't create a new target's id + profile → "Credentials
are not set up. Run this command again in interactive mode." Run eas build --platform ios --profile production --local (interactive, Apple login + 2FA) ONCE; after that the
non-interactive build works.
Target name must be space-free + match the EAS-registered target.name: "My Widget" makes the Xcode target "My Widget" but EAS keys creds on the sanitized
productName ("MyWidget") → the build's findNativeTargetByName throws "Could not find
target … in project.pbxproj." Space-free name + a displayName for the label; pin
bundleIdentifier.
An App Group (or any capability) on the extension is a credential black hole.eas
does NOT sync capabilities to the EXTENSION App ID ("Synced capabilities: No updates"
yet signing fails "profile doesn't support the … App Group"). Reuse can't add a
capability; even a freshly-regenerated profile lacks it until you enable it on the
identifier by hand (portal → Identifiers → the extension id → App Groups ✓ → assign
the group), then delete + recreate the PROFILE. Delete the PROFILE, not the
identifier — deleting the App ID re-registers it WITHOUT the capability, strictly worse.
A deep-link-only widget needs NO entitlements — declare none, skip the saga; add the App
Group only when the widget must read app data (shared-UserDefaults "last result").
cleanPrebuild (rm ios/android) does NOT touch targets/. A stale
generated.entitlements re-links on the next prebuild after you drop it from
expo-target.config.js — delete it by hand. Gitignore the generated artifacts.
Ship (local build → store)
The full local-build → store-submit flow (LANG/shell rules, no-double-bump, background +
poll, ground-truth verify, stopShip) is the ship skill — this section is the
on-device render gate it leans on. In short:
iOS: repo's prod build-and-submit target (make/script step) = clean prebuild → IPA →
eas submit to TestFlight, in the non-login shell. Bump the marketing version first if
the last already shipped — but a build that FAILED after a bump leaves that version
UNSHIPPED, so reuse it, don't bump again. Apple processes ~5–10 min after the upload.
Verify-before-ship: native visual changes (shaders, particles, a 3D scene) invisible
to the compiler — a real on-device render is the only proof. Magenta + square particles
pass the build.
A build that compiles + uploads can still DIE AT LAUNCH — a native version/ABI-skew
(dyld symbol-missing) crash shows in NEITHER the build NOR the store upload, only when the
build OPENS on a device. Install + open it ONCE before trusting the ship; if it bounces,
read the device crashlog (Console.app / Devices & Simulators → View Device Logs).
DYLD … Symbol not found = native version skew (see Gotchas), not app code.
Red flags — stop
"Renders fine" no screenshot you opened → drive it, read it.
Ship a native shader/scene change straight to TestFlight, no sim render → magenta risk.
Treat a Requiring unknown module redbox as a code bug → stale Metro desync; reload + dismiss.
bash -lc for a pod / EAS build → visionos error coming; use a non-login shell.
Maestro flow via stdin, or Cyrillic inputText → write a flow file, use ASCII.
Hold a foreground shell through a 20-min build → background + poll the log.
Maestro element not found on a screen you know renders → a system dialog (iCloud
re-auth / permission) on top; dismiss the SYSTEM button, not the app's.
bash -c non-login build but no LANG export → visionos gone but
Encoding::CompatibilityError coming; export LANG=en_US.UTF-8 too.
New apple-targets extension + straight --non-interactive build → "Credentials not set
up"; do the one-time interactive eas build --local first.
eas says a capability "synced" on an extension but signing fails "doesn't support App
Group" → it's not on the identifier; enable on the portal identifier + recreate the profile.
Android package com.<slug> does not exist at compileJava → stale incremental
autolinking; rm -rf android, prebuild fresh.
Trust a "build completed" exit code → tee / Makefile || masks it; confirm a new IPA +
"Submitted".
tapOn a SwiftUI/@expo/ui switch's label does nothing → tap the switch control by point.
Launch a local iOS build without df -h → low disk kills pod install / archive mid-run
with a misleading error; free GBs first.
Maestro flow tapping from "home" after launchApp → it resumes the last screen;
deep-link or clearState to a known start.
Native dep off the SDK's pinned versions (a ~ resolved it up) → DYLD Symbol missing
launch crash that builds + ships clean. Run the SDK version-alignment check; pin exact.
"Uploaded = done" with nobody opening the build → a launch-time version/ABI-skew crash
passes build + upload; install, open once, read the crashlog.
"Looks like a circle" from a full-frame screenshot → MEASURE the node bounds + zoom-crop;
square discs, top-clipped shapes and off-centre numbers are invisible at scale.
RNGH Pressable sized with an inline / dynamic width (React Compiler on) → child stretches
(circle → square, often only after a re-render); size with a plain View + static StyleSheet,
fixed centred child.
See also
ship skill — driving a local-build → App Store / Play submit (LANG/shell rules,
no-double-bump, background+poll, ground-truth verify, stopShip). It gates on THIS
skill's device render before submitting.
purchases skill — IAP / store-metadata + RevenueCat: a version-controlled
source-of-truth for product ids + App Review notes, and pushing IAP reviewNote via the
App Store Connect API (fastlane deliver can't).
expo:* plugin skills (separate plugin, when installed) — SDK-specific depth:
expo:expo-dev-client (dev client + TestFlight), expo:building-native-ui,
expo:expo-module (native modules), expo:upgrading-expo, … This skill is the
device-driving + gotchas layer; lean on expo:* for API/SDK specifics.
stories skill → references/expo-verification.md — the build-time "is an Expo
change verified?" checklist (detect Expo, rebuild scope, Maestro/screenshot proof). It
defers HERE for the actual drive loop + the gotchas above.
Test on the latest iOS (the current simulator runtime), not a pinned version — a
feature floor (e.g. accessory / Control widgets) is a deployment-target detail, not the
test target.
Maestro launchApp RESUMES the last screen, not home. A flow assuming home (tap
"Settings"…) fails element not found when the app resumes mid-app from a prior run
(e.g. a game arena left open). Start from a known state — deep-link to the target route,
or launchApp: { clearState: true } — don't assume the home screen.
Metro --clear while a dev client is connected → Requiring unknown module N redbox
on a lazy import() (async-chunk id desync). Usually STALE — cold relaunch + one-two
Maestro tapOn: "Dismiss" clears it to a healthy screen. Not a code bug.
SceneKit / Metal shader-modifier failures render MAGENTA at RUNTIME, not xcodebuild. A
clean prod build BUILDS + SHIPS a magenta board uncaught. Verify a native shader on a
sim/device BEFORE the store submit. Classic trigger: #pragma arguments float3 + a KVC
uniform binding — hardcode colour literals instead.
Programmatic SCNParticleSystem with no particleImage draws hard SQUARES. Set a
soft radial (white→transparent) puff texture → smoke/fire/splash read as round puffs.
expo-doctor non-zero during a build usually benign (peer-dep + RN-directory-metadata
warnings) — doesn't fail the build or the submit.
Native dep version/ABI skew → DYLD Symbol missing CRASH AT LAUNCH. A native module
built against a different core ABI than the one linked — usually one dep drifted off the
SDK's pinned version, a single patch is enough → Termination Reason: DYLD … Symbol not found … (terminated at launch; ignore backtrace). Build + store upload pass CLEAN, no JS
runs, the build just won't open. PRE-SHIP gate: run the SDK's version-alignment check (Expo:
npx expo install --check) and pin the offender EXACT — a ~ range re-resolves it right
back up — then reinstall + clean rebuild.
System dialog over the app blocks Maestro — iCloud "verify password" re-auth, a push
/ ATT / location permission — reads as element not found (UI occluded, not gone).
Dismiss step taps the SYSTEM button ("Not Now" / "Allow"), not the app's "Cancel" /
"Skip". A change newly hitting a platform service (a sync that now actually queries)
surfaces a prompt older runs never saw — whole suite suddenly fails on the home screen →
screenshot before assuming a regression.
Stale incremental Android autolinking → bogus slug-derived package.expo run:android prebuilds INCREMENTALLY; a leftover android/**/autolinking.json keyed on
com.<slug> (slug my-app → com.myapp, not the real com.org.app) makes the
generated ReactNativeApplicationEntryPoint reference com.<slug>.BuildConfig →
compileDebugJavaWithJavac "package com. does not exist." rm -rf android for a
clean prebuild. (Expo uses expo-modules-autolinking, NOT RN CLI —
react-native.config.jsproject.android.packageName is ineffective.)
make … | tee log reports tee's exit (0), not the build's — and a Makefile eas build … || (test -f ipa) fallback masks failure too. exit ${PIPESTATUS[0]} after the
pipe; trust GROUND TRUTH (new IPA timestamp + "Submitted your app to App Store Connect"),
never the exit code.
Maestro can't flip a SwiftUI / @expo/ui Toggle by tapping its label — label Text +
switch are separate elements. Tap the switch control (point on the row's right edge);
gate it with the checked selector (when: notVisible: { id, checked: true }) so it
flips only when off.
A gesture-handler Pressable as the SIZED flex cell stretches its child — circle →
square. RNGH Pressable doesn't hold a fixed pixel width the way a plain View does,
and an INLINE / dynamic width style (worse with React Compiler on) lets the child disc
grow to fill the cell → a "circle" renders as a rounded square — and often only AFTER a
re-render (a freshly-toggled day) while the first-paint ones still look right. Fix: size
the cell with a plain View / STATIC StyleSheet entry, keep the shape a FIXED, centred
child, and mirror the screen's already-working sibling cell (e.g. the month-view DayCell)
instead of re-deriving sizes inline. onLayout on an RNGH Pressable is flaky too — put
it on a plain wrapper.
Absolute-fill background behind a separately-centred label clips / offsets on iOS. A
disc drawn as a position:absolute layer BEHIND a sibling number can sit off-centre or
get clipped at the top on iOS (fine on Android). Fix: make it ONE in-flow element — a
fixed circle with the label INSIDE it — so the cell centres the whole unit. (Keep an
absolute layer only for a shape that must bleed past the cell, like a joined period
pill.)
A native 3D / Skia view (SceneKit, react-native-skia, a Metal/GL surface) inside a
react-navigation formSheet (sheetAllowedDetents: "fitToContents") breaks RN layout for
its SIBLINGS. A sibling box (a toggle row, a label) overlaps the native view no matter
the child order, a wrapper View, a fixed-height slot, OR position:absolute — maestro hierarchy shows the two bounds overlapping by tens of px (the sheet's content-fit
measure + the native view reporting no intrinsic box). MEASURE with maestro hierarchy
before reshuffling flex for an hour; clean separation may need the native view in its own
detent-sized container (or dropping the sibling). It renders fine on a plain (non-sheet)
screen — so it's the sheet, not your styles.
Dismiss an iOS formSheet in Maestro with a grabber swipe-down, not a backdrop tap.
The backdrop tap is racy (works once, misses the next — leaving the sheet open so the next
step fails); swipe: { start: "50%,38%", end: "50%,97%", duration: 600 } is reliable. And
in a capture SWEEP (open → takeScreenshot → dismiss → next), the screenshot can race the
present animation and silently grab the PREVIOUS screen — the flow logs COMPLETED but the
PNG is the list behind the sheet. READ every captured frame; COMPLETED ≠ the right screen.
To drive or screenshot a PAYWALL, the product must be UNOWNED — tapping an OWNED premium
item usually EQUIPS it (no sheet opens), so a sweep silently captures the store grid instead.
Reset the purchases SDK's anonymous user to all-unowned by reinstalling the SAME build
(simctl uninstall + simctl install <existing .app> — also re-triggers onboarding, Skip
it; no rebuild needed). A sandbox/test SDK key (e.g. RevenueCat Test Store test_…) returns
SDK-configured prices, so set those to match prod to capture prod-looking paywalls without
waiting on store approval.
Attach a dev client to Metro + recover a blank screen (Android). Boot the emulator
detached, expo start --dev-client, adb reverse tcp:8081 tcp:8081, then deep-link
<scheme>://expo-development-client/?url=http%3A%2F%2Flocalhost%3A8081 to attach and pull
the bundle. The dev-launcher menu re-appears after a force-stop (Continue, or
keyevent 4, to dismiss). But adb shell input keyevent 4 (back) on a top-level route
drops the app to a BLANK screen — you backed OUT of the route, it didn't crash — recover
by re-launching the dev-client URL (or <scheme>://<route>), not by waiting.
An agent / tool file-write may not trip Metro fast-refresh — you read the OLD bundle. A
save that doesn't come from the editor's own save sometimes never reaches Metro's watcher,
so the device still runs the PREVIOUS code and your "fix" looks unchanged (or falsely
passes). Before trusting any after-edit screenshot, confirm a fresh Android Bundled … (N modules) / iOS Bundled … line appeared in the Metro log SINCE your edit; if not, force a
reload (re-launch the dev-client URL, or dev-menu → Reload) and re-shoot. A delta bundle
(… (1 module)) is the proof it picked up the change. WORSE after a prod build's
cleanPrebuild (rm ios/android): the still-running Metro from expo run:ios
detaches — a tool-write, a touch, AND a cold app relaunch all fail to re-bundle (you
keep running the OLD code; a stray (1 module) delta for an unrelated file fools you into
thinking it reloaded). Only KILL Metro (lsof -ti :8081 | xargs kill) + restart
expo start --dev-client --clear — a full (N modules) re-bundle — loads the new code.
A cold relaunch (force-stop → launcher / deep-link) RE-BUNDLES over Metro — a black /
blank frame with NO mounted UI for tens of seconds is NORMAL, not a crash. The first
probe after a kill catches the bundle still loading: empty view tree (Android uiautomator dump returns nothing / your target node missing), a blank iOS screenshot, Maestro
element not found. Don't read it as a failure and burn retries — poll: re-dump / re-shoot
in a loop until a known node appears, or watch the Metro log for the Bundled line, THEN
screenshot / navigate / assert. Hits BOTH platforms (the JS bundle loads on cold start
either way); a dev/Metro build pays it on every relaunch, a release build doesn't.
Two apps on the machine → the dev client attaches to the WRONG Metro. When a second
Expo project is already running expo start, it owns the default Metro port 8081, so a
freshly-launched dev client auto-attaches there and serves the OTHER project's bundle —
a baffling redbox (e.g. a "missing native module" naming a module/file the current app
doesn't even use, or just the wrong screen). expo run:ios --port 8082 moves THIS
project's Metro to a free port, but the launched binary still asks for 8081, and the
<scheme>://expo-development-client/?url=http://localhost:<port> deep link often does
NOT redirect it. Fix: set the binary's saved packager location, then relaunch — iOS
xcrun simctl spawn booted defaults write <bundleId> RCT_jsLocation "localhost:<port>";
Android adb reverse tcp:<port> tcp:<port> then the dev-client ?url= deep link.
Symptom = wrong-app bundle, not a code bug.
Native headerSearchBarOptions (react-native-screens) on iOS 26 floats to the bottom by
default. The default placement: "automatic" drops the search field to the BOTTOM of the
screen, overlapping content (a UIKit root-screen toolbar-integration bug) → set
placement: "stacked" and it anchors below the title bar as expected (rn-screens forces
allowToolbarIntegration:false for stacked, which dodges the bug). These header/search
options are JS nav config → they HOT-RELOAD on an already-built dev client (no native
rebuild), so iterate the layout live on the sim. (headerLargeTitle can also render blank
in some expo-router setups — if it does on yours, draw the big title in-content instead of
fighting it; verify per-app, don't assume.) A documented "native X can't anchor / doesn't
work here" is often a STALE, fixable conclusion — re-test the native option on-device first.
"Search visible at rest AND tucking on scroll" (Telegram-style) wants a working large
title; without one, drive it from JS.hideWhenScrolling: true on its own leaves a
stacked search HIDDEN at rest (pull-to-reveal). To show it at the top and hide it once the
list scrolls, keep headerSearchBarOptions mounted and REMOVE it (set undefined) past a
scroll threshold — with hysteresis whose gap clears the search bar's own height, or the
layout shift from removing it bounces the offset back over the threshold (flicker loop).
Gate to iOS — a Material toolbar search icon (Android) is compact and shouldn't hide on
scroll.
keyevent 4 left a blank screen → you backed out of the route, not a crash; re-launch the
dev-client URL to recover.
Black/blank frame, empty view tree, or Maestro element not found right after a
force-stop relaunch → still re-bundling over Metro (both platforms), not a crash; poll for
a known node or the Metro Bundled line before shooting or concluding.
Native search floating at the bottom of the screen on iOS 26 → default
headerSearchBarOptions placement; set placement: "stacked". (Large title blank in your
setup? draw it in-content.) Re-test any stale "native X doesn't work here" on-device —
header/search options hot-reload, so it's cheap.
Concluded a layout / shape change is fine from ONE platform → iOS and Android clip, centre
and size differently; spot-check shape-sensitive UI on the iOS sim too before ship.
Hand-building a custom cell / shape with inline, per-render sizes → mirror the screen's
existing working component and lift sizes into a static StyleSheet; inline / dynamic styles
are where shape bugs (and React Compiler surprises) hide.
Your edit isn't showing on device → you may be reading the OLD bundle; confirm a new Metro
Bundled line since the edit (force a reload if none) before concluding anything.
Edit still not loading after a prod build's cleanPrebuild → Metro detached; a touch /
relaunch won't do it — KILL Metro + expo start --dev-client --clear for a full re-bundle.
An hour reshuffling flex because a toggle / label overlaps a native (SceneKit / Skia)
preview → it's the native-view-inside-formSheet layout limit; maestro hierarchy to
measure, give the native view its own detent-sized container or drop the sibling.
Backdrop-tap to dismiss a formSheet in a capture sweep → racy; grabber swipe-down, and
READ every captured frame (a sweep can log COMPLETED yet grab the prior screen).
tapOn a premium item opens no paywall / it just equips → the product is OWNED; reset to
unowned (reinstall the same build) so the paywall sheet opens.
Verified a mutating tap by the optimistic frame only → re-open the screen / another view and
confirm the write PERSISTED through the store, not just the instant paint.
Changed a setting and nothing downstream moved → a derived / auto value (an average, a
cached default, a value computed from the data) is overriding it; the setting isn't the
source of truth. True for ANY setting → output — units, theme, thresholds, sort order, a
prediction — so change-it-and-watch is the universal test; the fix is to read the setting
directly and demote the computed value to a suggestion.
