feat(inventory): storage location filter chip (#1400)

Reporter pgladel manages multiple physical filament storage
  locations and wanted to narrow the inventory list to a specific
  location without typing a search query each time.

  Adds a new Storage Location dropdown chip on the inventory page,
  next to the existing Material / Brand / Category / Spool Name
  filters. Distinct values are pulled from the spool list with
  .trim() so accidental trailing whitespace doesn't render as a
  separate option. A "No location set" entry appears when at least
  one spool has an empty storage_location (mirrors the categoryNone
  group). Chip self-hides when no spool has a storage location set.

  Same shape as the Category chip from #729 — clear-all-filters and
  hasActiveFilters both include the new state.

  i18n: reuses existing inventory.storageLocation label, adds
  inventory.storageLocationNone in all 8 locales. Parity check
  holds at 4818 leaves per locale. 24 InventoryPage tests still
  pass, frontend build clean.

static/index.html

@@ -26,7 +26,7 @@
 
     <!-- Splash screens for iOS -->
     <link rel="apple-touch-startup-image" href="/img/android-chrome-512x512.png" />
-    <script type="module" crossorigin src="/assets/index-Cy6PHBkY.js"></script>
+    <script type="module" crossorigin src="/assets/index-DuEb_u5w.js"></script>
     <link rel="stylesheet" crossorigin href="/assets/index-Baw5c3Hn.css">
   </head>
   <body>