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/public/locales/en/common.json

@@ -191,11 +191,13 @@
             "weight_to_use": "Weight",
             "used_weight": "Used Weight",
             "remaining_weight": "Remaining Weight",
+            "remaining_value": "Remaining Value",
             "measured_weight": "Measured Weight",
             "used_length": "Used Length",
             "remaining_length": "Remaining Length",
             "initial_weight": "Initial Weight",
             "spool_weight": "Empty Weight",
+            "extra_weight": "Extra Weight",
             "location": "Location",
             "lot_nr": "Lot Nr",
             "first_used": "First Used",
@@ -205,6 +207,8 @@
             "archived": "Archived",
             "adjustment_history": "Adjustment History",
             "show_history": "Show History",
+            "print_history": "Print History",
+            "show_print_history": "Show Print History",
             "adjustment_timestamp": "Date/Time",
             "adjustment_type": "Type",
             "adjustment_type_weight": "Weight",
@@ -220,6 +224,7 @@
             "measured_weight": "How much the filament and spool weigh.",
             "initial_weight": "The initial weight of filament on the spool (net weight). Will use the weight from the filament object if not set.",
             "spool_weight": "The weight of the spool when it is empty. Leave empty to use the value from the filament or the manufacturer.",
+            "extra_weight": "Additional weight to account for when measuring, such as DryPods, custom spool holders, or other accessories.",
             "location": "Where the spool is located if you have multiple locations where you store your spools.",
             "lot_nr": "Manufacturer's lot number. Can be used to ensure a print has consistent color if multiple spools are used.",
             "external_filament": "You have selected a filament from the external database. A filament object (and possibly a manufacturer object) will be created automatically when you create this spool. This can create duplicate filament objects if you have already created a filament object for this filament."
@@ -377,6 +382,20 @@
             "name_required": "Name is required"
         }
     },
+    "print_job": {
+        "fields": {
+            "created": "Created",
+            "filename": "Filename",
+            "filament_used": "Filament Used",
+            "status": "Status",
+            "finished": "Finished"
+        },
+        "status": {
+            "pending": "Pending",
+            "completed": "Completed",
+            "cancelled": "Cancelled"
+        }
+    },
     "home": {
         "home": "Home",
         "welcome": "Welcome to your Spoolman instance!",
@@ -396,7 +415,17 @@
             "total_spools": "Total Spools",
             "total_filaments": "Filament Types",
             "total_vendors": "Vendors",
-            "total_weight": "Total Remaining"
+            "total_weight": "Total Remaining",
+            "total_value": "Inventory Value"
+        },
+        "analytics": {
+            "title": "Usage Analytics",
+            "7_days": "7 Days",
+            "30_days": "30 Days",
+            "90_days": "90 Days",
+            "total_used": "Total used: {{weight}} kg",
+            "used": "Used",
+            "by_material": "Usage by Material"
         }
     },
     "help": {