fix(inventory): tappable photo dots + non-truncated quantity scale

- Photo carousel dots are now tappable (jump to that photo) with a larger hit
  area, so you can browse all images even when swiping the small thumbnail is
  awkward.
- The quantity unit scale is a Wrap instead of a horizontal scroll, so every
  unit stays visible instead of being cut off.

apps/app_seeds/lib/ui/quantity_picker.dart

@@ -154,22 +154,19 @@ class _QuantityPickerState extends State<QuantityPicker> {
     return Column(
       crossAxisAlignment: CrossAxisAlignment.start,
       children: [
-        SizedBox(
-          height: 76,
-          child: ListView.separated(
-            scrollDirection: Axis.horizontal,
-            itemCount: kinds.length,
-            separatorBuilder: (_, _) => const SizedBox(width: 4),
-            itemBuilder: (context, i) {
-              final kind = kinds[i];
-              return _ScaleItem(
+        // Wrap (not a horizontal scroll) so every unit stays visible.
+        Wrap(
+          spacing: 4,
+          runSpacing: 4,
+          children: [
+            for (final kind in kinds)
+              _ScaleItem(
                 kind: kind,
                 label: unitLabel(t, kind),
                 selected: _kind == kind,
                 onTap: () => _select(kind),
-              );
-            },
-          ),
+              ),
+          ],
         ),
         if (_kind?.countable ?? false) ...[
           const SizedBox(height: 8),