docs(04-02): complete pin/favorite and due date plan

Tasks completed: 2/2
- Add togglePin and updateDueDate form actions
- Add pin button, due date picker, and pinned section UI

SUMMARY: .planning/phases/04-tags/04-02-SUMMARY.md

.planning/phases/04-tags/04-02-SUMMARY.md

@@ -0,0 +1,101 @@
+---
+phase: 04-tags
+plan: 02
+subsystem: ui
+tags: [svelte, forms, pinned, due-date]
+
+# Dependency graph
+requires:
+  - phase: 01-foundation
+    provides: Entry schema with pinned and dueDate columns
+provides:
+  - togglePin form action for pin state management
+  - updateDueDate form action for due date management
+  - Pin button UI in EntryCard expanded view
+  - Due date picker UI in EntryCard expanded view
+  - Pinned entries section at top of EntryList
+affects: [04-tags-03, filtering, sorting]
+
+# Tech tracking
+tech-stack:
+  added: []
+  patterns:
+    - Async form handlers with fetch and invalidateAll
+    - Derived state for filtered entry lists
+
+key-files:
+  created: []
+  modified:
+    - src/routes/+page.server.ts
+    - src/lib/components/EntryCard.svelte
+    - src/lib/components/EntryList.svelte
+
+key-decisions:
+  - "Use fetch/invalidateAll pattern for pin toggle (consistent with existing patterns)"
+  - "Due date stored as ISO string from native HTML5 date input"
+  - "Pinned section header uses uppercase label style"
+
+patterns-established:
+  - "Toggle actions: fetch POST to action, then invalidateAll to refresh"
+  - "Separated entry lists: $derived filters for subsets"
+
+# Metrics
+duration: 8min
+completed: 2026-01-31
+---
+
+# Phase 4 Plan 2: Pin/Favorite and Due Date Features Summary
+
+**Pin toggle button and due date picker with dedicated pinned entries section at top of list**
+
+## Performance
+
+- **Duration:** 8 min
+- **Started:** 2026-01-31T12:50:00Z
+- **Completed:** 2026-01-31T12:58:00Z
+- **Tasks:** 2
+- **Files modified:** 3
+
+## Accomplishments
+- Users can pin/unpin entries with visual feedback (yellow pin icon)
+- Users can set/clear due dates using native date picker
+- Pinned entries automatically appear in labeled section at top of list
+- Pin indicator and due date visible in collapsed entry view
+
+## Task Commits
+
+Each task was committed atomically:
+
+1. **Task 1: Add togglePin and updateDueDate form actions** - `a232a95` (feat)
+2. **Task 2: Add pin button, due date picker, and pinned section UI** - `164fc73` (feat)
+
+## Files Created/Modified
+- `src/routes/+page.server.ts` - Added togglePin and updateDueDate form actions
+- `src/lib/components/EntryCard.svelte` - Pin button, due date picker, collapsed view indicators
+- `src/lib/components/EntryList.svelte` - Separated pinned/unpinned entries with dedicated sections
+
+## Decisions Made
+- Used fetch/invalidateAll pattern for pin toggle (consistent with existing update patterns)
+- Due date stored as ISO date string from HTML5 date input (matches schema design)
+- Pinned section uses uppercase "PINNED" header for visual distinction
+
+## Deviations from Plan
+
+None - plan executed exactly as written.
+
+## Issues Encountered
+
+None
+
+## User Setup Required
+
+None - no external service configuration required.
+
+## Next Phase Readiness
+- Pin and due date features complete and functional
+- Ready for Plan 03: Tag system implementation
+- Entries have all organizational metadata (pinned, dueDate) needed for filtering/sorting
+
+---
+*Phase: 04-tags*
+*Completed: 2026-01-31*