Initial commit: LinkSyncServer and LinkSyncExtension projects with complete documentation, models, API endpoints, tests, and extension implementation

LinkSyncExtension/tests/README.md

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+# LinkSyncExtension Tests
+
+## Testing Strategy
+
+Browser extensions are tested differently than server applications:
+
+1. **Manual Testing** - Primary testing method
+2. **Firefox Nightly Testing** - Test in development mode
+3. **Puppeteer Playwright** - Automated E2E tests (optional)
+
+## Manual Testing Checklist
+
+### Installation
+- [ ] Load extension in Firefox
+- [ ] Verify icon appears in toolbar
+- [ ] Click icon opens popup
+
+### Settings
+- [ ] Enter server URL
+- [ ] Enter API key
+- [ ] Select sync mode
+- [ ] Save settings
+- [ ] Verify settings persist after reload
+
+### Bookmark Management
+- [ ] Add bookmark with form
+- [ ] Verify bookmark appears in list
+- [ ] Edit bookmark
+- [ ] Delete bookmark
+- [ ] Search filter works
+
+### Collections
+- [ ] Load collections list
+- [ ] Execute query
+- [ ] Create dynamic collection
+
+### Sync
+- [ ] Click "Sync Now"
+- [ ] Verify sync indicator
+- [ ] Check last sync timestamp
+
+### Offline Mode
+- [ ] Disconnect network
+- [ ] Add bookmark
+- [ ] Reconnect network
+- [ ] Verify bookmark syncs
+
+## Puppeteer Test Setup
+
+```javascript
+// tests/puppeteer.config.js
+module.exports = {
+    browsers: ['chromium'],
+    config: {
+        launch: {
+            args: ['--no-sandbox', '--disable-setuid-sandbox']
+        }
+    },
+    // Test scripts in tests/
+}
+```
+
+## Run Tests
+
+```bash
+# Manual testing - run in Firefox
+# Install Firefox Nightly and load extension
+
+# Automated testing (if Puppeteer installed)
+npm install puppeteer
+npx puppeteer tests/puppeteer.test.js
+```
+
+## Notes
+
+- Browser extensions cannot be fully automated
+- Manual testing is primary verification method
+- Use Firefox Nightly for development testing
+- Test in different browsers for compatibility