[Feature] CDM Charge-based Cooldown Tracking Bars

[Kirihasio2]

What does this PR do?

This PR adds a setting for charge-based ability bars in CDM to show a hashline separation and cooldown per-charge.

How was it tested?

8.4.7, Dev mode enabled through follower dungeons and multiple different classes/abilities.

Screenshots

20260716-0254-53.8080673.mp4

Checklist

• [✓ ] New settings default OFF (no behavior change without opt-in)
• [ ✓] Zero cost while disabled: no events registered, no polling, no hooks doing work, no frames built
• [✓ ] Cheap while enabled: event-driven (no polling, no timer-based logic, no per-frame allocations)
• [✓ ] No writes onto Blizzard-owned frames (weak-table pattern used); HookScript/hooksecurefunc only, never SetScript on Blizzard frames
• [✓ ] Tested in-game, works on live retail; no load errors on the 12.1 PTR client