feat(ui): close 6 P1 audit findings + 1 bonus mobile fix (Sprint 2)

- Dashboard MealCard: title truncate -> line-clamp-2, image shrinks to
  40x40 on <md to give the title room (B6).
- MealDetail: hero reworked to normal flow with stronger gradient;
  description runs through new cleanDescription() helper that strips
  14 spoonacular SEO patterns and trims to the last full sentence.
  Raw description moved to a 'Notes from source' disclosure (B7).
- Pantry: free-text aisle/unit replaced with <Select> populated from
  the new PANTRY_AISLES canonical enum; ingredient name field marked
  required. New PANTRY_AISLES export + PantryAisle type in types (B8).
- backend: alembic 0015_normalize_pantry_aisles maps free-text
  ingredient.aisle and grocery_item.aisle to canonical labels in a
  single transaction; downgrade raises (restore from snapshot).
  backend/scripts/dry_run_aisle_migration.sql is the read-only
  preview helper.
- ShoppingList: human-readable AISLE_LABEL map replaces raw snake_case
  aisle keys; 3-col stat grid with compact mobile sizing (B9 + S3.3).
- Pantry table: role/aria-label region and a right-edge white
  gradient hint at mobile horizontal overflow (B10).
- Recipes: pending/applied filter split, Apply and Reset buttons,
  active-count chip on the Filters button, role=region + aria-label
  on the panel (B11).
- Review/sprint2-verification.md and fix-ui-audit.md updated.

Build: npm run build (tsc + vite) green. tsc emits 0 errors.

Co-located audit + plan docs kept in sync: Review/ui-nielsen-audit.md
gains a Sprint 2 status block; fix-ui-audit.md has implementation
notes for each Sprint 2 task.

frontend/src/pages/Dashboard.tsx

@@ -75,16 +75,16 @@ function MealCard({ item, dragHandleProps, isDragging, onApprove: _onApprove, on
           <img
             src={item.recipe.image_url}
             alt={item.recipe.name}
-            className="w-14 h-14 object-cover rounded-lg flex-shrink-0"
+            className="w-10 h-10 md:w-14 md:h-14 object-cover rounded-lg flex-shrink-0"
           />
         ) : (
-          <div className="w-14 h-14 rounded-lg bg-surface-100 flex items-center justify-center flex-shrink-0">
-            <CookingPot className="w-6 h-6 text-surface-400" />
+          <div className="w-10 h-10 md:w-14 md:h-14 rounded-lg bg-surface-100 flex items-center justify-center flex-shrink-0">
+            <CookingPot className="w-5 h-5 md:w-6 md:h-6 text-surface-400" />
           </div>
         )}
         <div className="flex-1 min-w-0 pr-7">
           <Link to={`/meals/${item.id}`} className="block">
-            <h4 className="font-semibold text-sm text-surface-900 truncate group-hover:text-primary-700 transition-colors">
+            <h4 className="font-semibold text-sm text-surface-900 leading-tight line-clamp-2 group-hover:text-primary-700 transition-colors">
               {item.recipe?.name || 'Unknown Recipe'}
             </h4>
           </Link>