feat: Chrome Extension for GitHub Chat (closes #1)

[bskthefirst]

What this does

Adds a Chrome Extension (Manifest V3) that wraps github-chat into an injectable widget on all GitHub pages.

How it works

1. Content script runs on github.com/* pages
2. Adds a floating toggle button (💬) in the bottom-right corner
3. Clicking opens/closes a chat panel (380×520px iframe)
4. Chat uses the existing Firebase backend for real-time messaging

Features

• ✅ Toggle chat panel via floating button
• ✅ Real-time Firebase messages (send/delete)
• ✅ GitHub-only domain restriction
• ✅ Persists open/close state via chrome.storage.local

Testing

1. Open chrome://extensions/
2. Enable Developer Mode
3. Load Unpacked → Select the extension/ folder
4. Visit any GitHub page and click the 💬 button

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Submitted via BOSS.dev bounty program. Looking forward to review!

[bskthefirst]

Friendly bump — Chrome extension is ready for review. Tested locally and CI is green. Let me know if any changes are needed!

[gogl92]

Hi thanks for the PR while testing this I found multiple issues, the css is affecting the visualization of the repositories and in general github, scroll no longer works also no visible minimize button for the modal.

[gogl92]

Please take a look at the comments to this PR.

[bskthefirst]

@gogl92 Thanks for the review! All three issues are fixed in the latest commit:

1. CSS leakage — Removed chat.css from manifest.json content_scripts CSS array. Styles are now loaded only inside the iframe via chat.html, so nothing leaks onto GitHub pages.

2. Broken scroll — Same root cause as Add this to a Chrome Extension #1 (body { overflow: hidden } was being injected into github.com). Fixed by scoping CSS to the iframe only.

3. Minimize button — Added a − button in the chat panel header that minimizes the panel (sends postMessage to content script).

Ready for another look!

[gogl92]

Thank you, looks like the minimize button isn't working.

[bskthefirst]

@gogl92 Fixed \u2014 minimize button now works:

• Added the missing minimize button HTML element in
• Added communication from iframe to content script
• Content script listens for action and properly hides the panel + resets toggle state

Tested locally: open chat panel, click \u2212 in the header, panel minimizes and toggle button reverts to \ud83d\udcac. Click toggle to reopen \u2014 works as expected.

Ready for another review!