Add Chrome extension for GitHub PR UI enhancements

[Copilot]

Chrome extension adding two features to GitHub pull request pages:

1. Copy PR link button - Next to PR title, copies {title}: {url} to clipboard
2. Request Copilot review button - Next to Copilot reviewer link, appears only on draft PRs

Implementation

manifest.json

• Manifest V3 with clipboardWrite permission
• Content script scoped to github.com/*/*/pull/*

content.js

• Injects buttons using GitHub's DOM selectors (.js-issue-title, .State[title="Status: Draft"])
• MutationObserver handles dynamic content loading
• Visual feedback with GitHub-themed icons (success/error states)
• Graceful fallbacks when GitHub DOM structure differs

// Feature 1: Copy PR link
const textToCopy = `${prTitle}: ${prUrl}`;
await navigator.clipboard.writeText(textToCopy);

// Feature 2: Request review (attempts UI automation)
const requestReviewBtn = reviewersSection.querySelector('button[aria-label*="request"]');
requestReviewBtn?.click();

Assets

• Icons: 16px, 48px, 128px PNG
• test.html: Local verification page
• Documentation: Installation, testing, troubleshooting

Screenshot

Test page demonstrating button placement and styling. Actual usage requires loading extension in Chrome via developer mode.

Notes

Request review feature uses fragile DOM selectors that may break with GitHub UI changes. Button provides user feedback when automation fails.

Original prompt

Create a chrome extension that makes two modifications to the github ui

1. On the pull requests page adds a button next to the PR title to copy to clipboard the following content: "PR Title: https://link-to-pr"

2. On the pull requests page adds a button next to the Copilot reviewer (href="/apps/copilot-pull-request-reviewer") that requests a review while the PR is in draft

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