chore(mobile): align all 7 Expo apps to SDK 55

Upgraded 6 apps from SDK 52/54 to SDK 55 (matrix was already on 55).
All apps now consistently use:
- Expo SDK ~55.0.5
- React Native 0.83.2
- React 19.2.0
- expo-router ~55.0.5
- NativeWind ~4.2.3

Before: 3 different SDK versions (52, 54, 55)
After:  1 version (55) across all 7 mobile apps

Added docs/EXPO_SDK_UPGRADE.md with testing checklist.

Note: pnpm install + device testing required to validate the upgrades.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

apps/traces/apps/mobile/package.json

@@ -21,25 +21,25 @@
 		"@react-native-async-storage/async-storage": "2.2.0",
 		"@react-native-community/slider": "5.0.1",
 		"@react-navigation/native": "^7.0.3",
-		"expo": "~54.0.0",
-		"expo-background-fetch": "~14.0.7",
-		"expo-background-task": "~1.0.8",
-		"expo-constants": "~18.0.0",
+		"expo": "~55.0.5",
+		"expo-background-fetch": "~55.0.4",
+		"expo-background-task": "~55.0.4",
+		"expo-constants": "~55.0.7",
 		"expo-dev-client": "^6.0.13",
 		"expo-dev-launcher": "^6.0.13",
-		"expo-location": "~19.0.0",
-		"expo-media-library": "~18.2.0",
-		"expo-router": "~6.0.0",
-		"expo-status-bar": "~3.0.0",
-		"expo-system-ui": "~6.0.7",
-		"expo-task-manager": "~14.0.0",
-		"nativewind": "latest",
-		"react": "19.1.0",
-		"react-dom": "19.1.0",
-		"react-native": "0.81.4",
+		"expo-location": "~55.0.6",
+		"expo-media-library": "~55.0.9",
+		"expo-router": "~55.0.5",
+		"expo-status-bar": "~55.0.4",
+		"expo-system-ui": "~55.0.9",
+		"expo-task-manager": "~55.0.4",
+		"nativewind": "~4.2.3",
+		"react": "19.2.0",
+		"react-dom": "19.2.0",
+		"react-native": "0.83.2",
 		"react-native-gesture-handler": "~2.28.0",
 		"react-native-maps": "1.20.1",
-		"react-native-reanimated": "~4.1.1",
+		"react-native-reanimated": "~4.1.5",
 		"react-native-worklets": "~0.6.1",
 		"react-native-safe-area-context": "~5.6.0",
 		"react-native-screens": "~4.16.0",