582f6764eb
## Summary - When deleting a mail from the single Mail View, \`pushAction()\` was called with \`unawaited\` before \`_navigateTo()\`. This meant the UndoShell snack bar fired *after* navigation had already started, showing the snack bar on the destination scaffold mid-transition — which prevented the snack bar's duration timer from starting correctly. - Fixed by changing \`unawaited(pushAction(...))\` to \`await pushAction(...)\`. Since Riverpod fires \`ref.listen\` synchronously when state changes, the UndoShell now queues the snack bar on the current stable scaffold *before* \`_navigateTo()\` is called. The snack bar then naturally transfers to the destination scaffold and auto-dismisses after 5 seconds as intended. Closes #399 ## Test plan - [x] All 338 unit/widget tests pass - [ ] Manually delete a mail from single Mail View and verify the snack bar appears and auto-dismisses after ~5 seconds - [ ] Verify the Undo button in the snack bar still works Co-authored-by: Thomas SharedInbox <sharedinbox@thomas-guettler.de> Reviewed-on: https://codeberg.org/guettli/sharedinbox/pulls/401