docs: Update CLAUDE.md with completed issue #19

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

CLAUDE.md

@@ -144,7 +144,7 @@ This is a fork with UX improvements. Issues are tracked on the Gitea instance ab
 | 16 | Filter Spools by Color | ✅ DONE |
 | 17 | Image Attachments for Filaments | **Open** |
 | 18 | QR Code Labels for Filaments | **Open** |
-| 19 | Integration with filamentcolors.xyz | **Open** |
+| 19 | Integration with filamentcolors.xyz | ✅ DONE |
 | 20 | Gallery View for Spools (Color Grid) | ✅ DONE |
 | 21 | QR Code Version/Complexity Config | **Open** |
 | 23 | Reporting & Data Export | **Open** |
@@ -588,6 +588,20 @@ Added cost analytics endpoint and total spent / avg cost per kg stats.
 - `client/src/pages/home/components/QuickStats.tsx` - Added "Total Spent" and "Avg Cost/kg" stat cards
 - `client/src/pages/home/components/UsageAnalytics.tsx` - Added cost per material in breakdown cards
 
+### Issue #19 Complete - filamentcolors.xyz Integration
+
+Color lookup from filamentcolors.xyz database (2134 swatches, 317 manufacturers).
+
+**Backend:**
+- `spoolman/api/v1/other.py` - Proxy endpoints:
+  - `GET /filamentcolors/manufacturers` - List all manufacturers
+  - `GET /filamentcolors/search` - Search swatches by manufacturer, color, filament type
+
+**Frontend:**
+- `client/src/components/filamentColorLookup.tsx` - Modal with manufacturer filter + color grid
+- Added search button next to ColorPicker on filament create and edit forms
+- Click a swatch to apply its measured hex color
+
 ### Bug Fixes
 
 - **Filament Select Refresh**: Fixed race condition where form value was set before options re-rendered. Uses `pendingFilamentId` state + useEffect.