Add interrupt-unavailable castbar fill color option

[Reveax]

Adds an optional castbar fill tint for target, focus, and boss casts when the player’s own interrupt is unavailable. The tint uses a configurable color from Colors > Castbar Colors and updates back mid-cast when the interrupt becomes available again.

Changes

• Added Recolor cast fill when interrupt is unavailable under Global Style > Castbar > Interrupt Ready Indicator.
• Added Interrupt unavailable cast color under Colors > Castbar Colors.
• Wired the setting through defaults, profile import/export, search, and color APIs.
• Extended castbar tinting to use the unavailable color through the existing secret-safe C-side color selection path.
• Added active-cast tracking so cooldown flips repaint target/focus/boss castbars without adding idle OnUpdate work.
• Kept cooldown event registration scoped to active castbars that need interrupt-ready or fill-tint refreshes.

[Mapkov2]

The feature already exists so I don't see the point of this or other then feature bloat

[Reveax]

Yeah that's fair. I understand the concern and too was a bit hesitant about it. Personally it completes the last piece of customization so the interrupt bar is consistent across the different contexts I have it in, but I also get your point. Up to you in the end of course, but I thought instead of maintaining it for just personal use, some people could also be interested with the same thought as me.

[Mapkov2]

If you can do the PR for the main branch incooperate it into the current interrupt indicator as option via drop-down in the castbar menu and move the the color options to the respected color Menu yes I'll add it. Sorry if this came across as a bit harsh. Ty for feedback

[Reveax]

Don't worry about it, nothing was interpreted as harsh :)
So im happy todo the changes, to clarify, you mean moving it as an option for "Indicator Style" into the dropdown and wiring the color option into the "Interrupt Ready Indicator" section in castbar colors?

[Mapkov2]

I have a dedicated interrupt indicator section in castbars menu. So backend what you want is already in so you just need to configure your styling of it.

[Reveax]

Now sits as an indicator style option with its color respectively in the section.

[Mapkov2]

And the options to turn it on is in the castbar menu? (Not home can't check)

[Reveax]

Unless there's a different castbar menu, which I'm interpreting wrong. It can be found at "Appearence > Castbars > Interrupt Ready indicator" as an "Indicator Style" in the drop-down. Sorry if there might be an misunderstanding and thanks for the quick responses!

[Mapkov2]

Yes there is under focus kick the last menu interrupt indicator and your version is basically just a different style. Instead of a border. Also keep in mind that glow effect might override your idea. So keep that also in mind

[Reveax]

Thanks for the headsup, i did some testing and glowis visible on player/preview, but target/focus castbars do not seem to visibly apply the glow fade even on a fresh install and profile, without my changes. The unavailable fill style follows the existing target/focus castbar color path, so it does not appear to introduce a new regression, but target/focus glow itself may already be limited/not visible.

Also rebased into 5.54 so its up to main

[Mapkov2]

Yeah good. The Castbar won't be rewritten so will be easy to implement into 6.0 rewrite of UF/GF. Ty for contributing btw. Did you join the discord?

[Reveax]

No worries, thanks for your amazing work! And yeah just joined the discord!