After a successful /api/voices fetch, results are written to sessionStorage
(key ttsvc_vc). On the next page load loadVoiceLibrary() reads the cache and
renders voices immediately before the network request completes, eliminating
the blank-list / skeleton flash entirely.
The background fetch always runs and overwrites the cache with fresh data.
Error handling is graceful: if the network fails but cache was served, the
error is suppressed (stale data stays visible). The Refresh button clears the
cache first to force a full reload cycle.
Silent-refresh logic (from v1.12.19) prevents the second loadVoiceLibrary()
call (engines.js batch E) from blanking already-rendered voices.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
mARTin-B78
ad155f6c5c
