chore: archive v2.2 User Experience Polish milestone

Phases 28-31 archived to milestones/v2.2-phases/
Requirements and roadmap snapshots archived to milestones/

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

.planning/milestones/v2.2-phases/29-image-presentation/29-01-SUMMARY.md

@@ -0,0 +1,50 @@
+---
+phase: 29
+plan: 01
+subsystem: backend
+tags: [schema, image-processing, sharp]
+key-files:
+  created: []
+  modified:
+    - src/db/schema.ts
+    - src/shared/schemas.ts
+    - src/server/services/image.service.ts
+    - src/server/routes/images.ts
+    - package.json
+metrics:
+  tasks: 7
+  commits: 5
+  files-changed: 6
+---
+
+# Plan 29-01 Summary: Schema + Dominant Color Extraction
+
+## What was built
+- Installed Sharp image processing library for server-side color extraction
+- Added `dominant_color`, `crop_zoom`, `crop_x`, `crop_y` columns to items, global_items, and thread_candidates tables
+- Created `extractDominantColor()` function that resizes image to 1x1 pixel for weighted average color
+- Integrated color extraction into both image upload endpoints (direct and from-url)
+- Updated Zod schemas for items, candidates, and global items to accept new fields
+- Generated Drizzle migration (db:push deferred — requires running database)
+
+## Commits
+
+| Task | Commit | Description |
+|------|--------|-------------|
+| 1 | cee1500 | Install Sharp for image processing |
+| 2 | 36363a8 | Add dominantColor and crop fields to schema |
+| 3 | b637b10 | Generate migration for image presentation fields |
+| 4 | e305fa7 | Add dominant color extraction via Sharp |
+| 5 | 2696b78 | Extract dominant color in image upload endpoints |
+| 6 | 3480473 | Add image presentation fields to Zod schemas |
+| 7 | — | No changes needed (storage service already spreads fields) |
+
+## Deviations
+- Task 3 (db:push): Database not accessible in dev environment — migration generated but push deferred to deployment. This is non-blocking for frontend work.
+
+## Self-Check: PASSED
+- Sharp installed: YES
+- dominant_color in 3 tables: YES (grep confirms 3 occurrences)
+- Zod schemas updated: YES (3 schemas)
+- Upload returns dominantColor: YES
+- Lint passes: YES