[Feature Request] Add Visual Indicator for A–B Repeat Range on Track

[KodeBarista]

Issue/Description:
Currently, COSMIC Player provides A–B repeat functionality but lacks any clear visual indication on the track/progress bar when this mode is active. This makes it difficult for users to understand:

• Whether A–B repeat is currently enabled
• The exact start (A) and end (B) points of the loop
• The active looping region during playback

Expected Behavior:
The track should provide a clear, intuitive visual representation of the A–B repeat state and range.

Suggested Solution:

• Display two distinct markers on the progress bar:
  • A (start point): small vertical handle
  • B (end point): similar handle
  • Use a subtle accent-colored segment on the track to indicate the active loop range
  • Tooltip for vertical handle on hover/seek (e.g., “A” and “B”)

Other Notes:
This improvement would significantly enhance usability for users relying on A–B repeat for focused listening, practice, or analysis.