feat: Add color column with filter to spool list

Add optional color column to spool list showing filament color swatches
with multi-select filtering capability.

Backend:
- GET /api/v1/color endpoint to list distinct filament colors
- filament.color_hex query param on spool list for filtering

Frontend:
- ColorFilterColumn component renders color swatches
- useSpoolmanColors() hook fetches available colors
- Filter dropdown shows swatches with hex codes
- Column hidden by default (enable via column selector)

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

CLAUDE.md

@@ -122,7 +122,7 @@ Environment variables (see `.env.example`):
 
 This is a fork with UX improvements. Issues are tracked on the Gitea instance above.
 
-## UX Improvement Issues
+## UX Improvement Issues (Gitea)
 
 | # | Title | Status |
 |---|-------|--------|
@@ -132,16 +132,23 @@ This is a fork with UX improvements. Issues are tracked on the Gitea instance ab
 | 4 | Layout Max-Width | ✅ DONE |
 | 5 | Temperature Ranges | ✅ DONE |
 | 6 | Spool Adjustment History | ✅ DONE |
-| 7 | 3dfilamentprofiles Integration | ❌ REMOVED (bot protection) |
-| 8 | (see Gitea #8) | ✅ DONE |
-| 9 | Hierarchical Locations (Room/Bin) | Open |
+| 7 | 3dfilamentprofiles Integration | ❌ REMOVED |
+| 8 | (duplicate of #7) | ✅ DONE |
+| 9 | Hierarchical Locations (Room/Bin) | **Open** |
 | 10 | Database Import/Export | ✅ DONE |
-| 11 | Theme Colors | ✅ DONE |
-| 12 | Clickable Dashboard Cards | ✅ DONE |
-| 13 | QR Code Size Setting | ✅ DONE |
-| 14 | Parse Temps from Comments | ✅ DONE |
-| 15 | Print Job Tracking / Slicer Integration | ✅ DONE |
-| 16 | Prev/Next Navigation on Edit Pages | ✅ DONE |
+| 11 | Slicer Integration / Print Jobs | ✅ DONE |
+| 12 | Redesign Home Page Dashboard | **Open** |
+| 13 | Batch Operations (Multi-Select Edit) | **Open** |
+| 14 | Extra Weight Field (DryPods, etc.) | **Open** |
+| 15 | Spool Count per Filament in List | **Open** |
+
+### Other Features (not tracked in Gitea)
+- ✅ Theme Colors (5 options)
+- ✅ Clickable Dashboard Cards
+- ✅ QR Code Size Setting
+- ✅ Parse Temps from Comments
+- ✅ Prev/Next Navigation on Edit Pages
+- ✅ Color Column in Spool List (with filter)
 
 ### Issue #1 Complete - Inline Creation Modals
 
@@ -326,6 +333,28 @@ Track pending print jobs from slicer and manage filament deduction after prints
 - Configure via env vars: `SPOOLMAN_URL`, `SPOOLMAN_SPOOL_ID`
 - Or config file: `~/.config/spoolman/slicer.conf`
 
+### Color Column in Spool List
+
+Added optional color column to the spool list with filtering capability.
+
+**Backend:**
+- `spoolman/database/filament.py` - `find_colors()` function to get distinct color hex codes
+- `spoolman/api/v1/other.py` - `GET /api/v1/color` endpoint to list all colors
+- `spoolman/api/v1/spool.py` - Added `filament.color_hex` query parameter for filtering
+- `spoolman/database/spool.py` - Filter implementation (supports comma-separated values)
+
+**Frontend:**
+- `client/src/components/column.tsx` - `ColorFilterColumn` component renders color swatches
+- `client/src/components/otherModels.tsx` - `useSpoolmanColors()` hook to fetch colors
+- `client/src/pages/spools/list.tsx` - Added color column (hidden by default)
+- `client/public/locales/en/common.json` - Added "Color" translation key
+
+**Features:**
+- Color displayed as small swatch with hex tooltip
+- Filter dropdown shows swatches with hex codes
+- Multi-select filtering (can filter by multiple colors)
+- Column hidden by default (enable via column selector)
+
 ---
 
 ## Deployment