Let subtitles use the available player width (v1.24.1)

[tomqwu]

The custom subtitle players preserved line breaks authored for video captions, so short cues occupied two lines even in a wide blue bar. Both player styles now collapse those breaks for display and wrap to their available width. Slide captions also use the full panel width; page captions stay vertically centered.

Validated the reported caption at 23 seconds with the shipped recording in Chromium and WebKit: one line at 1440px and natural two-line wrapping at 390px, in both page and slide players, with no clipping. Rendered screenshots and site/publication checks pass; all 167 narration destinations retain their reviewed content. This CSS-only player patch retains the v1.24.0 PDFs and unchanged audio/caption timing. Publication remains gated by the full CI browser groups.

[tomqwu]

Published and verified in v1.24.1. The main workflow passed the build, all five browser groups, deployment and release.

Hosted checks used the reported recording at 23 seconds in both Chromium and WebKit. The caption renders on one line at 1440px and wraps naturally to two at 390px, in both slide and page players, with no clipping. All 20 release digests, 23 served files and eight page editions were verified. Audio, VTT text/timing and the v1.24.0 PDFs are unchanged.