Volume Control Improved (Absolute Volume fixed)

[park-bit]

This Pull Request introduces several quality-of-life enhancements and stability improvements to AudioPlaybackConnector:

Key Changes:

• Independent Mobile Volume Control: Added a dedicated slider to adjust Bluetooth audio volume independently from the PC's master volume.
• Volume Button Locking: Added an option to prevent phone volume buttons from altering the PC's master volume (fixes "Absolute Volume" sync issues).
• Run at Startup: Implemented a non-elevated startup toggle so the app can start with Windows without requiring an Administrator prompt.
• Interaction Stability: Robust tray icon click handling that works reliably across more Windows versions.
• Instructional UI: Added an "Instructions & Tips" dialog to help users with connectivity.

Technical Details:

• Updated manifest to asInvoker to remove unnecessary UAC prompts on startup.
• Refactored tray icon registration to ensure the click handler initializes correctly even if ghost icons exist.
• Added persistence for new settings in the JSON configuration.

Tested on Windows 10 and 11.