Fix Assisted Highlight glow customization

[Llusty]

Summary

Add opt-in Assisted Highlight glow customization to Action Bars while preserving the existing EUI Assisted Highlight behavior and settings.

This update is now based on v9.1.5 and addresses the performance/settings concerns raised in review.

Changes

• Keep the existing Assisted Highlight options:
  • Default (Blizzard)
  • Glow Ring
  • Button Overlay
  • Ring + Overlay
  • Overlay Opacity
  • Assisted Highlight Outset
• Add the Custom Proc Glow styles to the existing Assisted Highlight dropdown as optional choices.
• Add an independent Assisted Highlight color setting.
• Add independent Class Color support for custom Assisted Highlight glows.
• Keep Assisted Highlight settings fully separate from Custom Proc Glow:
  • assistGlowType
  • assistGlowColor
  • assistGlowUseClassColor
• Preserve the existing assistGlowStyle setting and its default behavior for existing users.
• Add a dedicated Assisted Highlight preview.

Performance / compatibility

Custom Assisted Highlight glows are purely opt-in.

Existing users continue to use the previous Assisted Highlight path unless they explicitly select one of the new custom glow types.

The custom glow path is change-guarded before calling StopAllGlows() and starting a new procedural glow. The guard checks the active glow type, button size, glow color, and wrapper state.

As a result, the rate-limited Assisted Highlight rescan does not restart the procedural animation when nothing has changed.

The existing Blizzard/EUI highlight path remains separate and does not use the procedural custom-glow engine.

Behavior

Custom Proc Glow and Assisted Highlight use independent settings.

Changing:

procGlowType / procGlowColor / procGlowUseClassColor

does not change:

assistGlowType / assistGlowColor / assistGlowUseClassColor

and vice versa.

Switching back from a custom Assisted Highlight glow restores the selected legacy/Blizzard Assisted Highlight behavior.

Testing

The implementation was previously tested in-game on v9.1.3 with:

• Default (Blizzard)
• Glow Ring
• Button Overlay
• Ring + Overlay
• Custom Assisted Highlight glow types
• Custom colors
• Class colors
• Overlay opacity
• Assisted Highlight outset
• Switching between legacy and custom glow modes
• Independence from Custom Proc Glow

The same Assisted Highlight commit has now been cleanly rebased onto v9.1.5 without conflicts or additional unrelated changes.