feat: add Safari support

[balloman]

Summary

• Add a Safari WXT dev script
• Use a browser action popup so Safari MV2 gets a normal toolbar popup
• Avoid Safari content-script startup crashes when requestIdleCallback is unavailable
• Add local agent guidance requiring conventional-commit PR titles

Validation

• pnpm lint
• pnpm format:check
• pnpm wxt build -b safari

Summary by CodeRabbit

• Bug Fixes
  • Improved startup reliability by canceling pending initialization when the page changes, helping prevent unnecessary work or duplicate loading.
• Chores
  • Updated the extension version to 2.0.1.
  • Added Safari-specific development support.

[coderabbitai]

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Review details

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: dfdcb932-ef81-4460-9101-6ec58d0f2598

📥 Commits

Reviewing files that changed from the base of the PR and between ed1fdb3 and b558f77.

📒 Files selected for processing (3)

• AGENTS.md
• package.json
• src/entrypoints/content/index.tsx

📝 Walkthrough

Walkthrough

The content script’s initial mount scheduling is now cancelable and is canceled during invalidation before cleanup. The repository also adds agent instructions, bumps the package version, and adds a Safari development script.

Changes

Cancelable Mount Scheduling

Layer / File(s)	Summary
Cancelable scheduler and invalidation cleanup src/entrypoints/content/index.tsx	Introduces cancelInitialMount with idle-callback or timeout fallback cancellation, and calls it in ctx.onInvalidated before disconnecting the observer and running cleanup.

Repository Metadata Updates

Layer / File(s)	Summary
Agent instructions and package metadata AGENTS.md, package.json	Adds AGENTS.md instructions, updates the package version, and adds the dev:safari script.

Estimated code review effort: 2 (Simple) | ~10 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly summarizes the main change: adding Safari support.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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