feat: make frontend fully responsive with mobile-first layout

Add mobile-responsive design with full feature parity:
- Bottom sheet (vaul) with 3 snap points for map+list coexistence
- Swipeable property cards with horizontal scroll-snap
- Hamburger menu with health, tasks, user info
- Full-screen map with repositioned legend (top-left on mobile)
- Filter FAB opening Sheet drawer
- TaskProgressDrawer from bottom on mobile
- All changes gated behind useIsMobile() hook (768px breakpoint)
- Desktop layout completely untouched

New components: MobileBottomSheet, SwipeableCardRow,
PropertyCardCompact, MobileMenu

Also fixes: idempotent longitude migration, React hooks order

frontend/package-lock.json

@@ -48,6 +48,7 @@
         "react-virtuoso": "^4.18.1",
         "tailwind-merge": "^3.3.1",
         "tailwindcss": "^4.1.10",
+        "vaul": "^1.1.2",
         "zod": "^3.25.67"
       },
       "devDependencies": {
@@ -7844,6 +7845,19 @@
         }
       }
     },
+    "node_modules/vaul": {
+      "version": "1.1.2",
+      "resolved": "https://registry.npmjs.org/vaul/-/vaul-1.1.2.tgz",
+      "integrity": "sha512-ZFkClGpWyI2WUQjdLJ/BaGuV6AVQiJ3uELGk3OYtP+B6yCO7Cmn9vPFXVJkRaGkOJu3m8bQMgtyzNHixULceQA==",
+      "license": "MIT",
+      "dependencies": {
+        "@radix-ui/react-dialog": "^1.1.1"
+      },
+      "peerDependencies": {
+        "react": "^16.8 || ^17.0 || ^18.0 || ^19.0.0 || ^19.0.0-rc",
+        "react-dom": "^16.8 || ^17.0 || ^18.0 || ^19.0.0 || ^19.0.0-rc"
+      }
+    },
     "node_modules/vite": {
       "version": "6.3.5",
       "resolved": "https://registry.npmjs.org/vite/-/vite-6.3.5.tgz",