Harden core app stability and offline media flow

[krishna3554]

Motivation

• Improve app robustness by adding global crash/error reporting and replacing silent catches with recorded non-fatal errors and user-visible fallbacks.
• Reduce storage and network impact by compressing captured photos before producing overlays and by lowering final overlay JPEG quality.
• Make map thumbnails and static map requests resilient and fast by adding caching for map assets.
• Ensure reliable backups with offline-first queueing and automatic retry when connectivity returns, and make gallery scrolling performant by decoding thumbnail-sized images.

Description

• Add a central reporter ErrorReporter that initializes Firebase Crashlytics and wires FlutterError.onError, PlatformDispatcher.instance.onError, and zoned error capture in main.dart.
• Add ImageCompressionService to compress camera captures before overlay generation and lower final JPEG quality in ImageOverlayService.
• Implement connectivity and offline backup plumbing via ConnectivityService and an enhanced BackupService that persists a retry queue, exposes uploadPhotosForUser, and starts auto-retry on reconnect; queueing is invoked after a successful local save in the result flow.
• Improve camera/gallery/result error handling to surface messages to users and report non-fatal errors via ErrorReporter, and switch gallery grid thumbnails to resized decoding (cacheWidth) for lower memory and faster loads.
• Cache map assets by switching OSM tile thumbnails to CachedNetworkImage and making Google static map fetches go through a BaseCacheManager fallback; add related dependencies in pubspec.yaml.

Testing

• Ran git diff --check to validate diffs and whitespace issues (passed with no errors).
• Attempted to run flutter pub get but it failed in this environment because the Flutter SDK is not available (flutter: command not found), so dependency resolution and package-level build/tests were not executed here.
• No platform/integration tests were executed in this environment; further CI/run-by-developer verification is recommended (install Flutter, run flutter pub get, then flutter analyze and flutter test on a machine with the SDK).

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[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Keep BackupService constructible at existing call sites

Changing BackupService to a non-const constructor breaks the existing const BackupService() field initializer in lib/features/account/screen/account_screen.dart, so the app will no longer compile whenever that screen is analyzed/built. Either update that call site to drop const or preserve a const-compatible constructor path.

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