add-webcodecs-bug

# Add WebCodecs Bug ## Workflow 1. Read `packages/docs/docs/mediabunny/webcodecs-bugs.mdx` to understand the current table format. 2. Open the provided issue URL with the `browser:control-in-app-browser` skill. 3. On the issue page, verify: - issue title - created or filed date - reporter or filed-by identity - current status and resolution state 4. Map the browser tracker to the table fields: - Product: Chromium issues are `Chrome`, WebKit Bugzilla issues are `Safari`, Mozilla Bugzilla issues are `Firefox`. - Filed by: use the known handle from the task when the tracker only exposes a redacted email. Known reporter mappings: - `musica-viva.de` or `dp@...@musica-viva.de` → `@Vanilagy` - Fixed?: use `Yes` only for fixed or verified-fixed issues, `No` for open/new/assigned/unresolved issues, and `Won't fix` for explicitly rejected or wontfix resolutions. 5. Add one Markdown table row to `packages/docs/docs/mediabunny/webcodecs-bugs.mdx`. Preserve the existing table columns and wording. Do not add a date column unless the docs file already has one or the user explicitly asks for it. ## Verification After editing, inspect the diff and confirm the row has the right URL, product, filed-by value, and fixed state.