Add scanner utility, modal, and stock scan page implementation

src/features/dashboard/dashboard-page.js

@@ -15,6 +15,7 @@ export function renderDashboardPage() {
             </p>
             <div class="d-flex flex-wrap gap-2">
               <a href="#/labels/new" class="btn btn-primary btn-lg">Create label</a>
+              <a href="#/scan" class="btn btn-outline-primary btn-lg">Scan item</a>
               <a href="#/stock" class="btn btn-outline-primary btn-lg">Browse stock</a>
             </div>
           </div>
@@ -70,10 +71,10 @@ export function renderDashboardPage() {
           </a>
         </div>
         <div class="col-12 col-md-6 col-xl-3">
-          <a class="quick-card" href="#/stock">
-            <span class="quick-card-label">Adjustments</span>
-            <strong>Fast quantity updates</strong>
-            <span class="text-body-secondary">Apply increments, decrements, or exact counts with clear feedback.</span>
+          <a class="quick-card" href="#/scan">
+            <span class="quick-card-label">Scanning</span>
+            <strong>Use, spoil, or inspect</strong>
+            <span class="text-body-secondary">Scan a label or barcode and act on the matching item.</span>
           </a>
         </div>
         <div class="col-12 col-md-6 col-xl-3">