Finish the captions.

Recover partial captions and clearly identify incomplete preparation.

In this release

Fixed
When the caption engine succeeds, earlier model initialization failures retry once automatically. Successful captions stay saved, and recovery finishes before preparation is marked complete.
Refined
Details identify incomplete captions and offer retry or continue without captions instead of presenting a fully ready Play button.
Diagnostics
Model errors include safe network, memory, runtime, or unknown categories to help investigate initialization failures.