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/create.tsx

@@ -51,6 +51,7 @@ export const SpoolCreate: React.FC<IResourceComponentsProps & CreateOrCloneProps
 
   const initialWeightValue = Form.useWatch("initial_weight", form);
   const spoolWeightValue = Form.useWatch("spool_weight", form);
+  const extraWeightValue = Form.useWatch("extra_weight", form);
 
   if (props.mode === "clone") {
     // Clear out the values that we don't want to clone
@@ -208,10 +209,15 @@ export const SpoolCreate: React.FC<IResourceComponentsProps & CreateOrCloneProps
     return initialWeightValue ?? selectedFilament?.weight ?? 0;
   };
 
+  const getExtraWeight = (): number => {
+    return extraWeightValue ?? 0;
+  };
+
   const getGrossWeight = (): number => {
     const net_weight = getFilamentWeight();
     const spool_weight = getSpoolWeight();
-    return net_weight + spool_weight;
+    const extra_weight = getExtraWeight();
+    return net_weight + spool_weight + extra_weight;
   };
 
   const getMeasuredWeight = (): number => {
@@ -402,6 +408,21 @@ export const SpoolCreate: React.FC<IResourceComponentsProps & CreateOrCloneProps
           <InputNumber addonAfter="g" precision={1} />
         </Form.Item>
 
+        <Form.Item
+          label={t("spool.fields.extra_weight")}
+          help={t("spool.fields_help.extra_weight")}
+          name={["extra_weight"]}
+          rules={[
+            {
+              required: false,
+              type: "number",
+              min: 0,
+            },
+          ]}
+        >
+          <InputNumber addonAfter="g" precision={1} />
+        </Form.Item>
+
         <Form.Item hidden={true} name={["used_weight"]} initialValue={0}>
           <InputNumber value={usedWeight} />
         </Form.Item>