Fix mobile layouts across frontend (#10)

Bound mobile navigation, controls, searches, and overlays while adding route-wide responsive browser coverage.

.github/workflows/frontend-mobile.yml

@@ -0,0 +1,28 @@
+name: Frontend mobile
+
+on:
+  pull_request:
+    paths:
+      - 'frontend/**'
+      - '.github/workflows/frontend-mobile.yml'
+
+permissions:
+  contents: read
+
+jobs:
+  build-and-test:
+    runs-on: ubuntu-latest
+    defaults:
+      run:
+        working-directory: frontend
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-node@v4
+        with:
+          node-version: 20
+          cache: npm
+          cache-dependency-path: frontend/package-lock.json
+      - run: npm ci
+      - run: npm run build
+      - run: npx playwright install --with-deps chromium
+      - run: npm run test:mobile