docs: add progress tracker for CardDAV implementation

Task #1 completed, Task #2 needs 4 test interdependency fixes.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

PROGRESS.md

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+# CardDAV Contacts Implementation - Fortschritt
+
+**Stand:** 2026-05-04, Session pausiert bei ~82k Tokens
+
+## Abgeschlossene Tasks
+
+### ✅ Task #1: Implement server/services/cardav-sync.js
+- **Status:** COMPLETED
+- **Commits:** 
+  - 689b479: Initial implementation (850 lines service + 46 tests)
+  - c4b8b76: Critical fixes (Transaction handling, N+1 query optimization)
+- **Reviews:** 
+  - Spec Review: ✅ PASSED
+  - Code Quality: ✅ APPROVED
+
+### 🔄 Task #2: Add tests for cardav-sync service
+- **Status:** IN PROGRESS (needs final fix)
+- **Commits:**
+  - 96b4f43: Added 9 new tests (55 total)
+  - a38c2c8: Fixed test interdependencies and removed duplicate suite (54 tests)
+- **Reviews:**
+  - Spec Review: ✅ PASSED
+  - Code Quality: ❌ NEEDS FIX - 4 verbleibende interdependente Tests
+
+**VERBLEIBENDE ARBEIT für Task #2:**
+4 Tests in "Contact Merge Logic (DB)" suite sind noch interdependent:
+- Test 2 (line 968): "should add multiple phones to contact" - depends on Alice Smith
+- Test 3 (line 987): "should add multiple emails to contact" - depends on Alice Smith  
+- Test 4 (line 1006): "should add multiple addresses to contact" - depends on Alice Smith
+- Test 5 (line 1022): "should preserve primary entries" - depends on Alice Smith
+
+**Fix erforderlich:** Jeder Test muss seinen eigenen Contact erstellen, oder Suite-level `before` hook nutzen.
+
+## Ausstehende Tasks (3-10)
+
+- Task #3: Implement CardDAV management API routes
+- Task #4: Extend contacts API routes for multiple values
+- Task #5: Add API route tests
+- Task #6: Extend Settings UI with Contacts Sync section
+- Task #7: Add source badges to contact list
+- Task #8: Extend contact modal with new fields and multiple values
+- Task #9: Add UI interaction tests
+- Task #10: Integrate CardDAV sync into cron job
+
+## Nächste Schritte beim Fortsetzen
+
+1. Task #2 abschließen: Verbleibende 4 interdependente Tests fixen
+2. Code Quality Re-Review für Task #2
+3. Task #2 als completed markieren
+4. Mit Task #3 (API Routes) fortfahren
+
+## Wichtige Dateien
+
+- Design Doc: `docs/designs/2026-05-04-cardav-contacts-design.md`
+- Service: `server/services/cardav-sync.js` (849 lines)
+- Tests: `test-carddav.js` (54 tests, 4 need fixing)
+- Migration: `server/db.js` (Migration 30)
+
+## Git Status
+
+Branch: `feature/cardav-contacts`
+Basis: `main` (commit 6cc7267)
+Aktuell: commit a38c2c8
+
+Uncommitted changes: keine (außer dieser PROGRESS.md)