Improve README header and add dev smoke test

[bdtran2002]

Summary

• add a one-line bun run dev:test smoke check for local development
• document the quick local dev test flow in the README
• polish the README header with a larger icon and language badges

Summary by CodeRabbit

• Documentation

  • Enhanced README with improved visual layout, larger header icon, and centered design with enhanced badges.
  • Added "Quick local dev test" section documenting a fast local sanity check workflow.

• Chores

  • Added dev:test script for running type check, tests, and build verification in sequence.

[coderabbitai]

📝 Walkthrough

Walkthrough

The changes enhance the README with improved visual presentation through a centered HTML layout, larger header icon (160x160), and new TypeScript/HTML/CSS shields. A new "Quick local dev test" section documents the dev:test npm script. The corresponding package.json adds a dev:test script that chains typecheck, unit tests, and build operations sequentially.

Changes

Cohort / File(s)	Summary
README Documentation README.md	Increased header icon to 160x160, converted title and badges to centered HTML layout with explicit <h1> and tagline, added TypeScript/HTML/CSS shields, and introduced new "Quick local dev test" section describing the dev:test script as a fast sanity check.
NPM Scripts package.json	Added new dev:test script that sequentially executes typecheck, unit tests, and build commands for local validation.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~5 minutes

Possibly related PRs

• docs: rewrite README for current extension workflow #40: Overlaps in README documentation and developer npm script modifications.
• Simplify contributor instructions in README #29: Related changes to README developer instructions and addition of dev:test command reference.

Poem

🐰 A header now gleams at one-sixty-by-tall,
With shields brightly polished to impress one and all,
The dev:test command hops quick through the flow,
Type, test, and build—watch the pipeline go! 🚀

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 inconclusive)

Check name	Status	Explanation	Resolution
Description check	❓ Inconclusive	The PR description provides a clear bullet-point summary of changes but lacks the complete template structure with checkboxes and issue number reference as specified in the repository template.	Add the complete PR template with all checkbox sections and confirm issue number formatting to fully comply with repository standards.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title 'Improve README header and add dev smoke test' accurately summarizes both main changes in the PR: README header improvements and the new dev:test smoke test script.
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.

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/firefox-sidebar-followups

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_{Comment @coderabbitai help to get the list of available commands and usage tips.}

[coderabbitai]

Actionable comments posted: 1

🤖 Prompt for all review comments with AI agents

Verify each finding against the current code and only fix it if needed.

Inline comments:
In `@README.md`:
- Around line 132-139: The README mentions the local dev test command bun run
dev:test but the "Useful scripts" index omits it; update the README's "Useful
scripts" list to include an entry for dev:test (with a short description like
"fast local sanity check: typecheck, unit tests, Firefox build") so the command
is discoverable, ensuring the script name dev:test matches the example shown
earlier.

🪄 Autofix (Beta)

Fix all unresolved CodeRabbit comments on this PR:

• Push a commit to this branch (recommended)
• Create a new PR with the fixes

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: ASSERTIVE

Plan: Pro

Run ID: 01cfd8c5-c490-464a-9f7c-b6d6fade1659

📥 Commits

Reviewing files that changed from the base of the PR and between 2929b59 and 2d35dea.

📒 Files selected for processing (2)

• README.md
• package.json

[coderabbitai]

⚠️ Potential issue | 🟡 Minor

Keep script docs consistent with the command index.

Line [135] introduces bun run dev:test, but the later Useful scripts list doesn’t include it, which can cause discoverability drift.

📌 Suggested README update

 - `bun run typecheck`
 - `bun run test`
+- `bun run dev:test`
 - `bun run test:watch`

🤖 Prompt for AI Agents

Verify each finding against the current code and only fix it if needed.

In `@README.md` around lines 132 - 139, The README mentions the local dev test
command bun run dev:test but the "Useful scripts" index omits it; update the
README's "Useful scripts" list to include an entry for dev:test (with a short
description like "fast local sanity check: typecheck, unit tests, Firefox
build") so the command is discoverable, ensuring the script name dev:test
matches the example shown earlier.