docs(05-02): complete multi-forest navigation plan

- SUMMARY.md: navigation handlers, page persistence, fade animation, reward flow - STATE.md: advance to ready_for_verification, 100% progress, decisions logged - ROADMAP.md: Phase 05 marked complete (2/2 plans done)
2026-03-29 23:04:14 +02:00
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+---
+phase: 05-multi-wald-system-wald-pagination-und-navigation-zwischen-w-ldern
+plan: 02
+subsystem: ui
+tags: [forest, pagination, navigation, indexeddb, animation]
+
+# Dependency graph
+requires:
+  - phase: 05-01
+    provides: renderForestScene with page param, SLOTS_PER_PAGE constant, currentForestPage in Progress
+
+provides:
+  - Arrow navigation between forest pages (prev/next buttons wired in initForestScreen)
+  - currentForestPage persisted to IndexedDB on every navigation
+  - Fade-out/fade-in opacity transition on page change
+  - Post-lesson "Zurück zum Wald" navigates to page containing new element
+  - slotIndex in reward.ts uses SLOTS_PER_PAGE constant (no more hardcoded 12)
+
+affects:
+  - forest navigation flow
+  - reward screen back-to-forest flow
+
+# Tech tracking
+tech-stack:
+  added: []
+  patterns:
+    - navigateToPage closure captures currentPage in initForestScreen for correct button wiring
+    - saveProgress called with fresh getProgress read to avoid stale data on navigation
+
+key-files:
+  created: []
+  modified:
+    - src/forest/scene.ts
+    - src/forest/reward.ts
+    - src/app.ts
+
+key-decisions:
+  - "navigateToPage in initForestScreen reads fresh progress before saving to avoid overwriting concurrent changes"
+  - "Zurück zum Wald computes newPage from elements.length before initForestScreen to control which page is shown"
+  - "Fade animation uses grid.style.opacity toggle with requestAnimationFrame for natural transition"
+
+patterns-established:
+  - "Pattern: Page persistence reads fresh progress (getProgress) rather than mutating stale reference"
+
+requirements-completed: [MWLD-05, MWLD-06, MWLD-07]
+
+# Metrics
+duration: 2min
+completed: 2026-03-29
+---
+
+# Phase 05 Plan 02: Multi-Wald Navigation Summary
+
+**Arrow navigation between forest pages with IndexedDB persistence, fade animation, and correct post-lesson page targeting**
+
+## Performance
+
+- **Duration:** 2 min
+- **Started:** 2026-03-29T21:01:24Z
+- **Completed:** 2026-03-29T21:03:30Z
+- **Tasks:** 2 (+ 1 auto-approved checkpoint)
+- **Files modified:** 3
+
+## Accomplishments
+
+- Wired prev/next navigation buttons in `initForestScreen` with closure over `currentPage`
+- Persists `currentForestPage` to IndexedDB on every page navigation via `saveProgress`
+- Added 0.3s opacity fade-out/fade-in transition to `renderForestScene` for smooth page changes
+- "Zurück zum Wald" after lesson now computes last page from element count and updates progress before `initForestScreen`
+- Replaced hardcoded `% 12` in `reward.ts` slot calculation with `% SLOTS_PER_PAGE` import
+
+## Task Commits
+
+Each task was committed atomically:
+
+1. **Task 1: Wire navigation handlers and page persistence in initForestScreen** - `13b8df5` (feat)
+2. **Task 2: Fix reward flow and all renderForestScene call sites for pagination** - `8f88843` (feat)
+3. **Task 3: Verify multi-forest navigation** - auto-approved checkpoint (--auto mode)
+
+## Files Created/Modified
+
+- `src/forest/scene.ts` - Added `saveProgress` import, navigation button handlers with `navigateToPage` closure, fade animation
+- `src/forest/reward.ts` - Imported `SLOTS_PER_PAGE` from `./scene`, replaced `% 12` with `% SLOTS_PER_PAGE`
+- `src/app.ts` - Imported `SLOTS_PER_PAGE` and `getForestElements`; updated Zurück-zum-Wald callback to navigate to element's page
+
+## Decisions Made
+
+- `navigateToPage` reads fresh progress before saving to avoid overwriting data changed by other parts of the app during navigation
+- The "Zurück zum Wald" callback computes `newPage` from `elements.length` after the new element is already saved, so it always resolves to the correct last page
+- `initForestScreen` is called after setting `currentForestPage` in progress so the nav renders correctly from the start
+
+## Deviations from Plan
+
+None - plan executed exactly as written.
+
+## Issues Encountered
+
+None.
+
+## Next Phase Readiness
+
+- Multi-Wald navigation complete. Phase 05 is fully done.
+- Forest pagination is interactive, persistent, and animated.
+- No blockers.
+
+## Self-Check: PASSED
+
+- src/forest/scene.ts: FOUND
+- src/forest/reward.ts: FOUND
+- src/app.ts: FOUND
+- 05-02-SUMMARY.md: FOUND
+- Commit 13b8df5: FOUND
+- Commit 8f88843: FOUND
+
+---
+*Phase: 05-multi-wald-system-wald-pagination-und-navigation-zwischen-w-ldern*
+*Completed: 2026-03-29*