feat: habit tracker with gamification + KB updates

Merge feature/habit-tracker into master (squashed):

✨ Habit Tracker Features:
- Bead chain visualization (30-day history)
- Weekly lives recovery system (+1 life/week)
- Lucide icons (zap, shield) replacing emoji
- Responsive layout (mobile-optimized)
- Navigation links added to all dashboard pages

📚 Knowledge Base:
- 40+ trading basics articles with metadata
- Daily notes (2026-02-10, 2026-02-11)
- Health & insights content
- KB index restructuring

🧪 Tests:
- Comprehensive test suite (4 test files)
- Integration tests for lives recovery
- 28/29 tests passing

Commits squashed:
- feat(habits): bead chain visualization + weekly lives recovery + nav integration
- docs(memory): update KB content + daily notes
- chore(data): update habits and status data

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

memory/kb/health/exercise-snacks-protocol.md

@@ -0,0 +1,48 @@
+# Exercise Snacks Protocol - Marius
+
+**Start:** 2026-02-11
+**Scop:** Minim eficient 80/20 pentru birou (9 min/zi, 45 min/săpt)
+
+## Protocol Zilnic
+
+### 09:30 - Snack 1 (3 min)
+- 10 squats
+- 5 push-ups (pe genunchi OK)
+- 30 sec plank
+
+### 13:30 - Snack 2 (3 min)
+- 20 step-ups pe scaun
+- 20 high knees
+
+### 17:30 - Snack 3 (3 min)
+- 15 squats
+- 10 lunges (5 per picior)
+- Marș pe loc 1 min
+
+## Tracking
+
+Format: ✅ = done | ⏭️ = skip | ➖ = not yet
+
+### Săptămâna 1 (Feb 11-17)
+
+| Zi | 09:30 | 13:30 | 17:30 | Note |
+|----|-------|-------|-------|------|
+| Mar 11 |  |  |  |  |
+| Mie 12 |  |  |  |  |
+| Joi 13 |  |  |  |  |
+| Vin 14 |  |  |  |  |
+| Sâm 15 |  |  |  |  |
+| Dum 16 |  |  |  |  |
+| Lun 17 |  |  |  |  |
+
+## Beneficii (studii)
+
+- **-20% mortalitate** (studiu 661k oameni, 14 ani)
+- **Cardio health** (3x/zi × 7 zile = WHO minimum)
+- **87% compliance** în studii
+
+## Surse
+
+- <https://pmc.ncbi.nlm.nih.gov/articles/PMC4902280/>
+- <https://pmc.ncbi.nlm.nih.gov/articles/PMC11127831/>
+- <https://health.clevelandclinic.org/exercise-snacks>