Moe Hamade e54b2da29a refactor: Improve hotspot and APK sharing stability
This commit introduces several fixes and refinements to the hotspot sharing and APK handling features, improving stability, user experience, and robustness.

Key changes:

-   **Hotspot Flow:**
    -   Automatically starts the hotspot after the user grants the required Wi-Fi permission, removing the need for a second button press.
    -   Ensures all `HotspotManager` callbacks in `HotspotViewModel` are executed within `viewModelScope` to prevent threading issues and ensure safe UI updates.
    -   Fixes a potential `BroadcastReceiver` leak in `HotspotManager` by tracking its registration state, preventing crashes and resource leaks when stopping the hotspot.
    -   Changes the hotspot `WakeLock` to be non-expiring to prevent the CPU from sleeping while the hotspot is active.

-   **APK Handling & Installation:**
    -   Adds a pre-download disk space check in `UniversalApkManager` to prevent download failures on devices with insufficient storage.
    -   Improves the file move logic after download by falling back to a copy-and-delete strategy if a direct rename fails, making it more robust across different filesystems.
    -   Introduces `InstallResultReceiver` to provide clear Toast notifications to the user about the success or failure of an APK installation, including specific error reasons (e.g., "Not enough storage").

-   **Performance & UI:**
    -   Caches the generated HTML in `ApkWebServer` to improve performance by avoiding regeneration on every request.
    -   Throttles the APK download progress updates to prevent UI jankiness from too-frequent state changes.
    -   Moves hardcoded strings in the "Share App" UI to `strings.xml` for better localization and maintenance.
2026-07-24 17:15:00 +03:00
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