Implement Handler mobile app (React Native + Expo iOS)

Build the committed 2a interactive prototype from Handler Mobile.dc.html as
a real Expo app: six wired screens (Fleet, Agent detail, Answer, Spawn, Log,
Settings) with the exact state logic ported from the design's renderVals().

- Port Leeworks tokens (colors light/dark, typography, spacing, radii,
  shadows) to typed RN values in src/theme.
- Reimplement the design-system components used by the screens (Button,
  Badge, Icon, Switch, Select, TextField, segmented control, chip, tab bar).
- Shared store mirrors the prototype's single-screen navigation and the
  Waiting -> Running flip when agt-7a1d is answered.
- Real OS status bar / home indicator (safe-area insets) replace the mock
  phone chrome; dark mode follows system appearance.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01PdF2hHVQ4UUBFPtpeMQ81o

app/package.json

@@ -0,0 +1,29 @@
+{
+  "name": "handler-mobile",
+  "version": "1.0.0",
+  "main": "index.ts",
+  "scripts": {
+    "start": "expo start",
+    "ios": "expo start --ios",
+    "android": "expo start --android",
+    "web": "expo start --web"
+  },
+  "dependencies": {
+    "@expo-google-fonts/figtree": "^0.2.3",
+    "@expo-google-fonts/outfit": "^0.2.3",
+    "@expo-google-fonts/spline-sans-mono": "^0.2.3",
+    "expo": "~52.0.0",
+    "expo-asset": "~11.0.1",
+    "expo-font": "~13.0.0",
+    "expo-status-bar": "~2.0.0",
+    "react": "18.3.1",
+    "react-native": "0.76.9",
+    "react-native-safe-area-context": "^4.12.0",
+    "react-native-svg": "^15.8.0"
+  },
+  "devDependencies": {
+    "@types/react": "~18.3.12",
+    "typescript": "~5.3.3"
+  },
+  "private": true
+}