Fix camera permission refresh

[krishna3554]

Motivation

• The camera preview could remain stuck on the permission gate even after the user granted access, because the app relied on an initial permissionsGranted value and did not re-check camera access at runtime.
• Microphone/location permission requests could block startup camera initialization; the intent is to allow the camera to initialize when camera access is granted and avoid unrelated permission failures preventing detection.

Description

• Change AppPermissionHandler.requestAllPermissions to return success based on the camera grant and request location with locationWhenInUse instead of locationAlways, and add hasCameraPermission() for status checks.
• Add runtime camera-permission handling to the camera UI by introducing _hasCameraPermission, _checkCameraPermissionAndInit() and _requestCameraPermission() in CameraScreen, and show the permission UI until camera access is available.
• Catch CameraException access-denied codes and flip to the permission UI so the app no longer stays in the same state when access is denied or later granted.
• Initialize the CameraController with enableAudio: false and trigger a permission re-check and camera initialization in didChangeAppLifecycleState when the app resumes, and use openAppSettings() only for permanently denied/restricted camera states.

Testing

• Ran git diff --check to verify no whitespace/errors reported; this passed.
• Attempted dart format lib/core/utils/permission_handler.dart lib/features/camera/screen/camera_screen.dart but the dart tool is not available in this environment so formatting was not executed.
• No automated Flutter unit/widget tests were run in this environment.

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Codex Task