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.

backend/scripts/dry_run_aisle_migration.sql

@@ -0,0 +1,76 @@
+-- Dry-run: show which rows WOULD change under the aisle normalization
+-- migration 0015. Safe to run against any database; makes no changes.
+--
+-- Usage (from the deployment host):
+--   psql "$DATABASE_URL" -f backend/scripts/dry_run_aisle_migration.sql
+
+WITH src AS (
+  SELECT
+    'ingredient'::text    AS tbl,
+    id::text              AS id,
+    aisle                 AS old_aisle,
+    LOWER(COALESCE(aisle, '')) AS key
+  FROM ingredient
+  WHERE aisle IS NOT NULL
+  UNION ALL
+  SELECT
+    'grocery_item'::text,
+    id::text,
+    aisle,
+    LOWER(COALESCE(aisle, ''))
+  FROM grocery_item
+  WHERE aisle IS NOT NULL
+),
+mapped AS (
+  SELECT
+    tbl, id, old_aisle,
+    CASE key
+      WHEN 'canned goods' THEN 'Pantry'
+      WHEN 'canned'       THEN 'Pantry'
+      WHEN 'freezer'      THEN 'Frozen'
+      WHEN 'frozen'       THEN 'Frozen'
+      WHEN 'produce'      THEN 'Produce'
+      WHEN 'fruit'        THEN 'Produce'
+      WHEN 'vegetable'    THEN 'Produce'
+      WHEN 'dairy'        THEN 'Dairy & Eggs'
+      WHEN 'eggs'         THEN 'Dairy & Eggs'
+      WHEN 'cheese'       THEN 'Dairy & Eggs'
+      WHEN 'milk'         THEN 'Dairy & Eggs'
+      WHEN 'yogurt'       THEN 'Dairy & Eggs'
+      WHEN 'meat'         THEN 'Meat & Seafood'
+      WHEN 'seafood'      THEN 'Meat & Seafood'
+      WHEN 'fish'         THEN 'Meat & Seafood'
+      WHEN 'chicken'      THEN 'Meat & Seafood'
+      WHEN 'beef'         THEN 'Meat & Seafood'
+      WHEN 'pork'         THEN 'Meat & Seafood'
+      WHEN 'meat_seafood' THEN 'Meat & Seafood'
+      WHEN 'bakery'       THEN 'Bakery'
+      WHEN 'bread'        THEN 'Bakery'
+      WHEN 'beverage'     THEN 'Beverages'
+      WHEN 'beverages'    THEN 'Beverages'
+      WHEN 'drinks'       THEN 'Beverages'
+      WHEN 'spice'        THEN 'Spices'
+      WHEN 'spices'       THEN 'Spices'
+      WHEN 'seasoning'    THEN 'Spices'
+      WHEN 'pantry'       THEN 'Pantry'
+      WHEN 'dry'          THEN 'Pantry'
+      WHEN 'snack'        THEN 'Pantry'
+      WHEN 'snacks'       THEN 'Pantry'
+      ELSE 'Other'
+    END AS new_aisle
+  FROM src
+)
+SELECT tbl,
+       COUNT(*)                AS rows_to_change,
+       COUNT(DISTINCT old_aisle) AS distinct_old_values
+FROM mapped
+WHERE old_aisle IS DISTINCT FROM new_aisle
+GROUP BY tbl
+ORDER BY tbl;
+
+-- Optional detail dump (uncomment to inspect actual rows):
+-- SELECT tbl, old_aisle, new_aisle, COUNT(*)
+-- FROM mapped
+-- WHERE old_aisle IS DISTINCT FROM new_aisle
+-- GROUP BY tbl, old_aisle, new_aisle
+-- ORDER BY tbl, old_aisle;