MeetCat 0.4.2

Makes meeting detection on the Google Meet homepage recover on its own
after reloads, forced re-logins, and slow renders, and adds an opt-in
diagnostic setting for troubleshooting parsing problems in release builds.

Added

• Added a "diagnostic DOM snapshots" toggle in the Developer section of
  the settings. When enabled, release builds save a snapshot of the
  homepage whenever parsing finds no meetings, keeping only the newest 10
  on disk. Inline script contents are stripped before saving. (Tauri)

Changed

• Changed meeting detection after app launch or a page reload to re-check
  the homepage on a short backoff instead of waiting for the next
  30-second tick. Meetings now typically appear within about 2 seconds of
  launch and 1 second of a reload. (Tauri)
• Changed the homepage reload watchdog to hold off on reloading a stale
  page while the next meeting starts within 45 minutes, so a reload can
  no longer cancel an imminent auto-join. (Tauri and extension)

Fixed

• Fixed meeting detection staying broken after Google forced a re-login
  or the page was otherwise navigated outside MeetCat: the recovery
  backoff built up by earlier failed reloads no longer blocks the fresh
  page, and a homepage that stays unparseable gets one rescue reload.
  (Tauri)
• Fixed a reload that comes back with an unparseable homepage being
  treated as "no meetings today". The page is now recognized as broken
  and recovered with bounded silent retries, an instant retry once the
  page becomes visible, and a rescue reload right before the remembered
  meeting starts. (Tauri and extension)
• Fixed the homepage not being re-checked when it becomes visible or
  focused while showing no meetings; it now re-parses immediately instead
  of waiting for the next daemon tick. (Tauri)
• Fixed a failure while capturing a diagnostic snapshot silently aborting
  the whole meeting check. (Tauri)