DarQ Reborn v2.2.7 - Update Checker Settings Toggle

This is a minor maintenance release that adds a toggle switch to enable/disable automatic update checks, improves the background update installation flow, and resolves several dialog issues.

🛠️ Bug Fixes & Improvements

• Update Checker Setting Switch: Added a toggle switch in Advanced Options to disable automatic update checking on launch.
• Settings Backup Integration: Integrated the update check preference into settings backup export/restore operations.
• Rich-Text Changelog Formatting: Added markdown rendering to the update notification dialog, replacing raw markdown syntax with clean, formatted rich text.
• Download Crash & Lifecycle Fixes: Resolved dialog dismissal crashes and fixed a Jetpack Navigation lifecycle crash that occurred when clicking the download button.
• Background Installer & Cache Optimizations: Added support for background update notifications to install downloads seamlessly when the app is minimized, and optimized the cache to prevent re-downloading already completed update files.