feat: Add quick wins batch (#42, #43, #25, #35, #20, #36, #39)

- #42: Allow spools heavier than theoretical max (remove weight clamps)
- #43: Show filament custom fields on spool detail page
- #25: Sort spools by custom fields and remaining weight
- #35: Global search box for spool list
- #20: Gallery view for spools (color grid with progress bars)
- #36: Spool-level color override with ColorPicker
- #39: Cost analytics endpoint, total spent & avg cost/kg stats
- Fix: Filament select refresh after inline creation
- Fix: Parse temperatures from filament comments

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

spoolman/api/v1/spool.py

@@ -57,6 +57,12 @@ class SpoolParameters(BaseModel):
         description="Extra weight to account for, such as DryPods, custom spool holders, etc., in grams.",
         examples=[50],
     )
+    color_hex: Optional[str] = Field(
+        None,
+        max_length=8,
+        description="Spool-level color override (hex code without #). Overrides the filament color if set.",
+        examples=["FF0000"],
+    )
     remaining_weight: Optional[float] = Field(
         None,
         ge=0,
@@ -299,6 +305,15 @@ async def find(
             description="Filter by spools with remaining weight (in grams) greater than this value.",
         ),
     ] = None,
+    q: Annotated[
+        Optional[str],
+        Query(
+            title="Search",
+            description=(
+                "Global search term. Searches across filament name, vendor name, material, and location."
+            ),
+        ),
+    ] = None,
     sort: Annotated[
         Optional[str],
         Query(
@@ -335,6 +350,7 @@ async def find(
 
     db_items, total_count = await spool.find(
         db=db,
+        q=q,
         filament_name=filament_name if filament_name is not None else filament_name_old,
         filament_id=filament_ids,
         filament_material=filament_material if filament_material is not None else filament_material_old,
@@ -456,6 +472,7 @@ async def create(  # noqa: ANN201
             initial_weight=body.initial_weight,
             spool_weight=body.spool_weight,
             extra_weight=body.extra_weight,
+            color_hex=body.color_hex,
             remaining_weight=body.remaining_weight,
             used_weight=body.used_weight,
             first_used=body.first_used,