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.
   • 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.