Make file caching fire-and-forget so IndexedDB writes do not block parsing and video loading.
*Actions*
Update the file pipeline code where saveFileWithMetadata(...) is called:
Replace await saveFileWithMetadata(...) with a non-blocking call that stores the promise in an array, e.g. cachePromises.push(saveFileWithMetadata(...).catch(e => logWarning(e))).
At the end of the pipeline kick off Promise.allSettled(cachePromises) but do not await it before parsing starts; instead log results or show a non-blocking notification on failure.
Add a configurable CACHE_BLOCKING boolean flag in config. Default false; if true (special mode) allow blocking for debugging.
Add logging and UI notification for cache failures without blocking the pipeline. Convert any alert() on quota errors into a non-blocking modal message or toast.
Add unit tests / smoke tests:
Simulate slow saveFileWithMetadata() (wrap with artificial delay) and confirm parsing and video loading start immediately without waiting for caching to finish.
Simulate a QuotaExceededError and confirm the pipeline continues.
*Check list*
Replace await saveFileWithMetadata(...) with non-blocking logic.
Pipeline starts parsing immediately even when cache save is delayed.
Promise.allSettled(cachePromises) is triggered and results logged.
UI shows non-blocking notification for cache failures (no alert() popups).
Tests simulate slow save and quota errors and pass.
