ci: add tag release workflow

[jevin98]

What changed

• Added a GitHub Actions release workflow that runs when a tag is pushed.
• The workflow installs dependencies, prepares WXT types, lints, type-checks, runs unit tests, packages all browser extension zip assets, and creates a GitHub Release for the tag.
• Release assets are uploaded from .output/*.zip.

Why

Tag pushes should automatically publish packaged extension builds to GitHub Releases so users can download browser-specific artifacts from the release page.

Validation

• pnpm exec eslint . --fix
• pnpm compile
• pnpm test:unit
• pnpm zip

[jevin98]

@codex review

[chatgpt-codex-connector]

Codex Review: Didn't find any major issues. 🎉

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