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

Linkding Browser Extension/LinkdingSync/task-brief.md

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+# Task Brief: Implement Playwright E2E Tests for LinkdingSync
+
+## Context
+LinkdingSync is a Firefox browser extension that synchronizes bookmarks with a self-hosted Linkding instance. Current state: Basic functionality exists but lacks comprehensive E2E test coverage for bookmark sync operations.
+
+## Goal
+Implement comprehensive Playwright E2E tests to increase test coverage and ensure bookmark sync reliability.
+
+## Acceptance Criteria
+- [ ] Tests pass for happy path (bookmark creation, sync to Linkding)
+- [ ] Tests fail appropriately for invalid API responses
+- [ ] Tests run under 5 minutes (Firefox primary)
+- [ ] Coverage increases by at least 50%
+- [ ] Tests include proper setup/teardown (browser launch, API authentication)
+- [ ] Tests cover: bookmark creation, API sync, conflict resolution, folder structure, auto-tag generation
+
+## Constraints
+- Don't modify core extension logic (manifest.json, main sync logic)
+- Use existing API patterns (token authentication)
+- Keep tests focused on UI automation, not unit logic
+- Tests must work in headless mode for CI
+
+## Related Files
+- `@LinkdingSync\popup.html` - UI for bookmark entry
+- `@LinkdingSync\background.js` - Service worker
+- `@LinkdingSync\utils\sync.js` - Sync logic
+- `@LinkdingSync\manifest.json` - Extension config
+- `@LinkdingSync\playwright.config.ts` - Test configuration
+
+## Time Estimate
+45-60 minutes for initial test implementation
+
+## Checkpoints
+- 50%: Initial test structure created, first tests passing
+- 90%: Most tests implemented, iterating on fixes
+
+## Chatlog Reference
+- Session log: `@LinkdingSync\chatlog.md`