Addresses @rodboev + greptile review of #4671:
- panels.js switchToProfile(): pass timeoutToast:false to the /api/profile/switch
POST so a superseded or transient-but-successful switch no longer pops api()'s
generic 'Request timed out' error toast; the generation-guarded catch handler is
now the single source of truth for switch failure.
- panels.js: re-check _switchGen after the awaited renderSessionList() in the
in-progress-session branch so a rapid second switch can't have its workspace
skeleton cleared / a stale toast popped by a slower earlier switch (mirrors the
no-messages branch guard).
- style.css: group labels now fade in via skeletonFadeInDim (ends at opacity:.5)
instead of the shared skeletonFadeIn (ends at opacity:1 with fill-mode:both),
which was overriding their intended resting 50% opacity.
- 4 new static-source regression assertions locking the three fixes; CHANGELOG
Unreleased entry updated (fixed-shape skeleton note + the three review fixes).