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/database/spool.py

@@ -42,6 +42,7 @@ async def create(
     initial_weight: Optional[float] = None,
     spool_weight: Optional[float] = None,
     extra_weight: Optional[float] = None,
+    color_hex: Optional[str] = None,
     used_weight: Optional[float] = None,
     first_used: Optional[datetime] = None,
     last_used: Optional[datetime] = None,
@@ -70,7 +71,10 @@ async def create(
                     "remaining_weight can only be used if the initial_weight is "
                     "defined or the filament has a weight set.",
                 )
-            used_weight = max(initial_weight - remaining_weight, 0)
+            if remaining_weight > initial_weight:
+                # Spool is heavier than expected (manufacturing tolerance), adjust initial_weight
+                initial_weight = remaining_weight
+            used_weight = initial_weight - remaining_weight
         else:
             used_weight = 0
 
@@ -86,6 +90,7 @@ async def create(
         initial_weight=initial_weight,
         spool_weight=spool_weight,
         extra_weight=extra_weight,
+        color_hex=color_hex,
         used_weight=used_weight,
         price=price,
         first_used=first_used,
@@ -117,6 +122,7 @@ async def get_by_id(db: AsyncSession, spool_id: int) -> models.Spool:
 async def find(  # noqa: C901, PLR0912
     *,
     db: AsyncSession,
+    q: Optional[str] = None,
     filament_name: Optional[str] = None,
     filament_id: Optional[Union[int, Sequence[int]]] = None,
     filament_material: Optional[str] = None,
@@ -155,6 +161,20 @@ async def find(  # noqa: C901, PLR0912
     stmt = add_where_clause_str_opt(stmt, models.Spool.location, location)
     stmt = add_where_clause_str_opt(stmt, models.Spool.lot_nr, lot_nr)
 
+    # Global search: OR across multiple text fields
+    if q is not None and q.strip():
+        search_term = f"%{q.strip()}%"
+        stmt = stmt.where(
+            sqlalchemy.or_(
+                models.Filament.name.ilike(search_term),
+                models.Filament.material.ilike(search_term),
+                models.Vendor.name.ilike(search_term),
+                models.Spool.location.ilike(search_term),
+                models.Spool.lot_nr.ilike(search_term),
+                models.Spool.comment.ilike(search_term),
+            )
+        )
+
     # Filter by color_hex (exact match, supports multiple comma-separated values)
     if filament_color_hex is not None:
         if isinstance(filament_color_hex, str):
@@ -223,6 +243,18 @@ async def find(  # noqa: C901, PLR0912
                 sorts.append(models.Filament.name)
             elif fieldstr == "price":
                 sorts.append(coalesce(models.Spool.price, models.Filament.price))
+            elif fieldstr.startswith("extra."):
+                # Sort by custom field value
+                extra_key = fieldstr[len("extra."):]
+                extra_alias = sqlalchemy.orm.aliased(models.SpoolField)
+                stmt = stmt.outerjoin(
+                    extra_alias,
+                    sqlalchemy.and_(
+                        extra_alias.spool_id == models.Spool.id,
+                        extra_alias.key == extra_key,
+                    ),
+                )
+                sorts.append(extra_alias.value)
             else:
                 sorts.append(parse_nested_field(models.Spool, fieldstr))
 
@@ -260,7 +292,10 @@ async def update(
         elif k == "remaining_weight":
             if spool.initial_weight is None:
                 raise ItemCreateError("remaining_weight can only be used if initial_weight is set.")
-            spool.used_weight = max(spool.initial_weight - v, 0)
+            if v > spool.initial_weight:
+                # Spool is heavier than expected (manufacturing tolerance), adjust initial_weight
+                spool.initial_weight = v
+            spool.used_weight = spool.initial_weight - v
         elif isinstance(v, datetime):
             setattr(spool, k, utc_timezone_naive(v))
         elif k == "extra":