docs(05): create phase plan for multi-wald pagination

.planning/REQUIREMENTS.md

@@ -114,6 +114,16 @@ Requirements for initial release (MVP). Each maps to roadmap phases.
 - [x] **PLSH-05**: Globaler Error-Handler: Kindgerechte Fehlermeldung, kein Crash
 - [x] **PLSH-06**: CSS-Palette + Typografie vollständig gemäss Spec (Custom Properties, Quicksand, Nunito)
 
+### Multi-Wald-System
+
+- [ ] **MWLD-01**: Wald-Seite berechnet aus Element-Index (Math.floor(index / 12)), kein DB-Schema-Change
+- [ ] **MWLD-02**: renderForestScene zeigt nur 12 Elemente pro Seite (page-basiertes Slicing)
+- [ ] **MWLD-03**: Navigationspfeile (Links/Rechts) neben Waldszene, min 44px Touch-Targets, Pastellfarben
+- [ ] **MWLD-04**: "Wald X von Y" Textanzeige, Navigation bei nur einer Seite ausgeblendet
+- [ ] **MWLD-05**: currentForestPage in Progress gespeichert, nach Reload wiederhergestellt
+- [ ] **MWLD-06**: Nach Lesson-Abschluss automatisch zur Seite mit dem neuen Element navigieren
+- [ ] **MWLD-07**: Sanfte Fade-Animation beim Seitenwechsel
+
 ## v2 Requirements
 
 Deferred to future release. Tracked but not in current roadmap.
@@ -217,12 +227,20 @@ Which phases cover which requirements. Updated during roadmap creation.
 | PRNT-05 | Phase 4 | Complete |
 | PRNT-06 | Phase 4 | Complete |
 | PRNT-07 | Phase 4 | Complete |
+| MWLD-01 | Phase 5 | Planned |
+| MWLD-02 | Phase 5 | Planned |
+| MWLD-03 | Phase 5 | Planned |
+| MWLD-04 | Phase 5 | Planned |
+| MWLD-05 | Phase 5 | Planned |
+| MWLD-06 | Phase 5 | Planned |
+| MWLD-07 | Phase 5 | Planned |
 
 **Coverage:**
-- v1 requirements: 68 total
-- Mapped to phases: 68
-- Unmapped: 0 ✓
+- v1 requirements: 68 total (complete)
+- Phase 5 requirements: 7 total (new)
+- Mapped to phases: 75
+- Unmapped: 0
 
 ---
 *Requirements defined: 2026-03-29*
-*Last updated: 2026-03-29 after roadmap creation (coverage confirmed: 68/68)*
+*Last updated: 2026-03-29 after Phase 5 planning (75 total requirements)*