feat: Add nGPT integration tip and docs

- [docs] Add section "Integration with nGPT" including setup, usage, enforcement, benefits, and guide link (README.md:121)
- [chore] Bump userscript version from 1.6.1 to 1.6.2 (github-commit-labels.js:7)
- [feat] Create, style, populate, and append `ngptTip` element to `configWindow` (github-commit-labels.js:527-554)
- [feat] Add hover listeners for link within `ngptTip` (github-commit-labels.js:546-552)

docs: Add test repos section, move preview, bump version

- [docs] Add "Try it on these repositories" section (README.md:19-25)
- [docs] Move preview image below new section (README.md:26)
- [chore] Bump version to 1.6.1 (github-commit-labels.js:4)

update: Add config button & container for labels

- [update] Bump version from 1.5.1 to 1.6.0 (github-commit-labels.js:line 3)
- [update] Create a container div for grouping buttons (github-commit-labels.js:line 296)
- [update] Add config toggle button with styles and hover effects (github-commit-labels.js:line 322)
- [update] Remove z-index from toggle button style (github-commit-labels.js:line 312)
- [update] Append toggle and config buttons into container (github-commit-labels.js:line 352)

feat(parser): Add breaking change detection and styling

- [feat] Add breaking change detection logic in github-commit-labels.js:commit message parsing
- [feat] Add breaking change styling (red border, bold text) in github-commit-labels.js:label creation
- [feat] Add warning emoji for breaking changes in github-commit-labels.js:label text
- [docs] Update README.md with breaking change syntax and examples
- [release] Bump version to 1.5.1 in github-commit-labels.js

feat(config): Add debug mode functionality

- [feat] Add debug mode setting to user configuration (github-commit-labels.js:161)
- [feat] Implement debug logging function with timestamp (github-commit-labels.js:1220-1230)
- [feat] Add debug mode toggle in settings panel (github-commit-labels.js:623-636)
- [feat] Save debug mode setting to user config (github-commit-labels.js:974)
- [feat] Enhance safeQuerySelector with debug logging (github-commit-labels.js:1216-1240)
- [update] Add detailed debug logs throughout code execution (github-commit-labels.js:1256-1540)
- [update] Bump version from 1.4.0 to 1.5.0 (github-commit-labels.js:4)

refactor(perf): Improve robustness and performance

- [add] Create safeQuerySelector helper function (github-commit-labels.js:1203-1211)
- [add] Implement debounce utility function (github-commit-labels.js:1214-1225)
- [refactor] Use multiple selectors for finding commit messages (github-commit-labels.js:1239-1252)
- [add] Add try/catch error handling in commit processing loop (github-commit-labels.js:1263-1414)
- [perf] Apply debounce to MutationObserver callbacks (github-commit-labels.js:1436-1449)
- [refactor] Create dedicated setupMutationObserver function (github-commit-labels.js:1435-1451)
- [perf] Add cleanup listener on page unload (github-commit-labels.js:1462-1464)
- [perf] Apply debounce to navigation and event handlers (github-commit-labels.js:1470-1503)

feat: Add commit scope display option

- [feat] Add showScope option to user config (github-commit-labels.js)
- [feat] Create scope checkbox in config window UI (github-commit-labels.js)
- [feat] Update scope detection in commit message regex (github-commit-labels.js)
- [feat] Add scope display in tooltips (github-commit-labels.js)
- [feat] Implement optional scope display in labels (github-commit-labels.js)
- [version] Bump version from 1.2.2 to 1.3.0 (github-commit-labels.js)

docs: Update README with new image links and formatting

- [docs] Update image links to new previews in README.md
- [docs] Remove outdated image references in README.md
- [style] Adjust formatting for improved readability in README.md

feat: Update commit labels for deletions

- [update] Change version from 1.2.0 to 1.2.1 in github-commit-labels.js
- [feat] Add new labels 'delete' and 'del' with emojis
- [style] Maintain existing label structure for consistency

update: version bump to 1.2.0 with enhancements

- [update] Change version number from 1.1.0 to 1.2.0 in github-commit-labels.js