Add streaming text accent overlays#77
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Adds optional streaming text accent overlays for rich text rendering.
The overlay draws newly revealed non-link text from an uncolored cached layout, applies the accent color at draw time, fades each admitted range over 600ms, and decays new overlay admission across the first 2s of the stream. Applying the color at draw time avoids baking a full-alpha accent color into the cached text layout, so the overlay can visibly fade back to the normal text color.