feat(cdm): customize Rotation Assist highlight

[mTx87]

What does this PR do?

Adds opt-in styling controls for the Cooldown Manager Rotation Assist highlight:

• Blizzard Default, Solid Border, Pixel Glow, Shape Glow, Action Button Glow, Auto-Cast Shine, GCD, Modern WoW Glow, and Classic WoW Glow styles
• Default gold, class-colored, and custom color modes
• Physical-pixel thickness for Solid Border and Pixel Glow
• Configurable outset beyond the icon edge
• The existing Hide Rotation Helper setting remains the master-off switch

Absent settings preserve Blizzard's current template and behavior. Custom overlays are created lazily only when a highlight is required and are stopped/recycled when suggestions or profiles change, bars rebuild, or Assisted Combat is disabled. Blizzard aura frames use the restriction-safe animation path.

The settings live under the existing cdmBars profile subtree so the normal profile, spec-override, and conditional-override systems can capture them.

How was it tested?

• Tested in-game on live retail as Windwalker Monk
• Verified Default, Class Colored, and Custom modes persist after closing/reopening the options panel
• Verified the highlight updates across target changes
• Verified the generated test addon is not part of this branch
• git diff --check passes and all added code is ASCII-only
• PTR/12.1 client validation is still pending

Screenshots

Before/after screenshots will be attached to the PR.

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 metadata and restriction-safe rendering paths are used)
• Tested in-game, works on live retail; no load errors on the 12.1 PTR client

[mTx87]

before PR

after PR

after PR options