Add TextEffect compositing

[waldnercharles]

Text Effect Rendering

• The strike-through effect (<strike>) now uses a per-glyph approach, storing the thickness and deferring the actual line drawing until after all effects and color changes are applied. This ensures the strike line matches the final rendered color and position, including gradients and alpha.
• The CF_Strike struct now includes a color field, allowing strike-through lines to use the correct color, including gradients.
• The code for spawning text effects can now handle multiple effects at the same character index.

Fixes #480

[chatgpt-codex-connector]

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[bullno1]

I don't understand.

Is this included so that the elapsed time is only ticked once per frame?

[waldnercharles]

Yeah, that's exactly right. Without it, an effect's elapsed time was being incremented multiple times per frame. I can't remember if this was because of the while loop I introduced to support compositing effects, or if it happened after I ran multiple effects with the same text_id via cf_draw_push_text_id

[waldnercharles]

If we're looking for something more explicit I could introduce another bool, but, this one seemed to have the same lifetime semantics that I needed.