feat: Add extra weight, price tracking, print history, usage analytics

- Extra Weight Field (#14): Track DryPods, custom holders in spool weight
  calculations. New extra_weight field on spool with DB migration.

- Price/Cost Tracking: Compute remaining_value based on remaining weight
  and price. Added column to spool list, inventory value on dashboard.

- Print History: Show print job history on spool detail page with
  collapsible table showing filename, filament used, status, dates.

- Usage Analytics: New dashboard component with time-series chart
  showing daily consumption, period selector (7/30/90 days), and
  material breakdown. New API endpoints for analytics data.

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

client/src/pages/spools/list.tsx

@@ -89,6 +89,7 @@ const allColumns: (keyof ISpoolCollapsed & string)[] = [
   "filament.color_hex",
   "filament.material",
   "price",
+  "remaining_value",
   "used_weight",
   "remaining_weight",
   "used_length",
@@ -101,7 +102,8 @@ const allColumns: (keyof ISpoolCollapsed & string)[] = [
   "comment",
 ];
 const defaultColumns = allColumns.filter(
-  (column_id) => ["registered", "used_length", "remaining_length", "lot_nr", "filament.color_hex"].indexOf(column_id) === -1
+  (column_id) =>
+    ["registered", "used_length", "remaining_length", "lot_nr", "filament.color_hex", "remaining_value"].indexOf(column_id) === -1
 );
 
 export const SpoolList: React.FC<IResourceComponentsProps> = () => {
@@ -462,6 +464,19 @@ export const SpoolList: React.FC<IResourceComponentsProps> = () => {
               return currencyFormatter.format(obj.price);
             },
           }),
+          SortedColumn({
+            ...commonProps,
+            id: "remaining_value",
+            i18ncat: "spool",
+            align: "right",
+            width: 100,
+            render: (_, obj: ISpoolCollapsed) => {
+              if (obj.remaining_value === undefined) {
+                return "";
+              }
+              return currencyFormatter.format(obj.remaining_value);
+            },
+          }),
           NumberColumn({
             ...commonProps,
             id: "used_weight",