docs(03-02): complete file upload plan

Tasks completed: 3/3
- Add uploadImage form action with thumbnail generation
- Create ImageUpload component with drag-drop
- Integrate upload into QuickCapture

SUMMARY: .planning/phases/03-images/03-02-SUMMARY.md

.planning/phases/03-images/03-02-SUMMARY.md

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+---
+phase: 03-images
+plan: 02
+subsystem: images
+tags: [file-upload, drag-drop, multipart, optimistic-ui, form-actions]
+
+# Dependency graph
+requires:
+  - phase: 03-01
+    provides: image repository, storage utilities, thumbnail generation
+provides:
+  - uploadImage form action for multipart uploads
+  - ImageUpload component with drag-drop
+  - QuickCapture integration for image attachment
+affects: [03-03-camera-capture, 03-04-gallery-display]
+
+# Tech tracking
+tech-stack:
+  added: []
+  patterns: [optimistic preview with URL.createObjectURL, form action multipart handling]
+
+key-files:
+  created:
+    - src/lib/components/ImageUpload.svelte
+  modified:
+    - src/routes/+page.server.ts
+    - src/lib/components/QuickCapture.svelte
+
+key-decisions:
+  - "Image upload via fetch to form action (not HTML form) for programmatic control"
+  - "Optimistic preview using URL.createObjectURL for instant feedback"
+  - "Upload image after entry creation to ensure valid entryId"
+  - "Entries returned with images array from load function"
+
+patterns-established:
+  - "Form action multipart: formData.get('image') as File for file uploads"
+  - "Optimistic UI: show preview immediately, upload in background"
+  - "Object URL cleanup: revoke after upload completes"
+
+# Metrics
+duration: 2min
+completed: 2026-01-29
+---
+
+# Phase 03 Plan 02: File Upload Summary
+
+**Multipart file upload with drag-drop support and optimistic preview using form actions**
+
+## Performance
+
+- **Duration:** 2 min
+- **Started:** 2026-01-29T14:26:39Z
+- **Completed:** 2026-01-29T14:28:42Z
+- **Tasks:** 3
+- **Files modified:** 3
+
+## Accomplishments
+- uploadImage form action handles multipart file uploads
+- Validates file type (image/*) and entry existence before processing
+- Generates thumbnail using Sharp infrastructure from 03-01
+- ImageUpload component with drag-drop zone and button fallback
+- Optimistic preview shows image immediately during upload
+- QuickCapture allows attaching image to new entries
+- Load function returns entries with their images attached
+
+## Task Commits
+
+Each task was committed atomically:
+
+1. **Task 1: Upload form action with thumbnail generation** - `de3aa5a` (feat)
+2. **Task 2: ImageUpload component with drag-drop** - `a35b07e` (feat)
+3. **Task 3: Integrate upload into QuickCapture** - `400e499` (feat)
+
+## Files Created/Modified
+- `src/routes/+page.server.ts` - Added uploadImage action and entries with images in load
+- `src/lib/components/ImageUpload.svelte` - New drag-drop upload component (164 lines)
+- `src/lib/components/QuickCapture.svelte` - Added image attachment button and upload flow
+
+## Decisions Made
+- **Fetch to form action:** Use fetch() with FormData instead of HTML form submission for programmatic control over the upload flow
+- **Optimistic preview:** Use URL.createObjectURL() for instant preview while upload happens in background
+- **Sequential upload:** Create entry first, then upload image with the new entry ID to ensure valid foreign key
+- **Images in load:** Attach images array to each entry in the load function for immediate display
+
+## Deviations from Plan
+
+None - plan executed exactly as written.
+
+## Issues Encountered
+
+None.
+
+## User Setup Required
+
+None - no external service configuration required.
+
+## Next Phase Readiness
+- File upload infrastructure complete and ready for use
+- Camera capture (03-03) can reuse uploadImageForEntry pattern
+- Gallery display (03-04) can use images array from load function
+
+---
+*Phase: 03-images*
+*Completed: 2026-01-29*