Player(Shell): add audio boost control

[ivelinmegdanov]

This PR enhances the volume control system by introducing dynamic volume limits, improved UI feedback, and shell-based volume boosting. The following improvements have been implemented:

• Volume Boosting Logic:

  • Max volume is now 200 only when shell.active is true.
  • Default max volume remains 100 when shell.active is false.

• Improved UI for Volume Slider:

  • Added gradient feedback for warning and danger levels:
    • White (0-100%) → Yellow (150%) → Red (200%)

• Keyboard & Scroll Volume Control Fixes:

  • ArrowUp & ArrowDown keys now correctly adjust volume within valid ranges.
  • Mouse Scroll (onWheel) correctly respects volume limits and prevents overflows.
    • mouse scroll (onWheel) volume control is limited to 100%
    • To increase volume beyond 100% (up to 200%), the user must manually adjust the slider or use keyboard controls
  • Note: In the previous version, inside the Stremio shell, users were able to infinitely increase the volume using the ArrowUp and onWheel controls. There was no upper limit, allowing volume to exceed reasonable levels.

Note: This feature is designed only for the shell because browsers impose a hard limit on volume at 100%.

Closes Issue #322
Closes https://github.com/Stremio/stremio-tasks/issues/319

[CLAassistant]

All committers have signed the CLA.