fix: remove unused native expo dependencies (close #041)

[CNduka001]

PR #116 Remove Unused Native Expo Dependencies
Overview
This PR addresses issue #116 by auditing and removing unused native Expo dependencies from the mobile application. By removing these packages, we reduce the app's bundle size, simplify the dependency tree, and eliminate unnecessary native permissions.

Changes
Dependency Removal: Removed expo-speech-recognition, expo-image-picker, expo-local-authentication, and expo-network from package.json.
Config Update: Removed the expo-speech-recognition plugin from app.json and cleaned up the plugins array.
Hook Optimization: Stubbed the following hooks to remove native imports while preserving public API compatibility:
src/hooks/useCamera.ts
src/hooks/useNetworkStatus.ts
src/hooks/useBiometricAuth.ts
src/hooks/useVoiceRecognition.ts
Service Refactoring: Updated src/services/mobileAuth.ts to remove the biometric authentication dependency and provide appropriate fallback error messages.
Verification Results
Traced all imports of the removed packages and confirmed they were only used in the modified hooks/services.
Ensured the application still compiles and that UI components using these hooks (like AvatarCamera and VoiceSearch) degrade gracefully.
Verified app.json and package.json JSON integrity.

Closes #116

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