fix: keep sync snackbar anchored correctly

[criticalAY]

Purpose / Description

When the sync toolbar button is tapped while the search action view isexpanded, the keyboard is dismissed (focus leaves the search field) but the action view stays expanded, so the FAB remains hidden. The post-sync snackbar therefore shows unanchored, and the FAB is only restored when the user leaves and returns to the activity.

Also, when search is toggled while a snackbar is already showing, the snackbar's anchor becomes stale, either hovering above a hidden FAB (leaving a gap above the keyboard) or overlapping the FAB when it comes back.

Fixes

• Fixes FAB/Add button not shown after sync click #20765

Approach

1. onOptionsItemSelected(R.id.action_sync) : collapse toolbarSearchItem before starting the sync. That fires
   onMenuItemActionCollapse -> showFloatingActionButton(), so the FAB is back by the time the sync result snackbar appears.
2. onMenuItemActionExpand: after hideFloatingActionButton(), null out activeSnackBar?.anchorView so a live snackbar drops to sit above the keyboard instead of hovering where the FAB used to be.
3. onMenuItemActionCollapse: after showFloatingActionButton(), re-anchor activeSnackBar?.anchorView to fabMain so it sits above the FAB instead of being overlapped by it.

How Has This Been Tested?

Pixel 10

Learning (optional, can help others)

NA

Checklist

Please, go through these checks before submitting the PR.

• You have a descriptive commit message with a short title (first line, max 50 chars).
• You have commented your code, particularly in hard-to-understand areas
• You have performed a self-review of your own code
• UI changes: include screenshots of all affected screens (in particular showing any new or changed strings)
• UI Changes: You have tested your change using the Google Accessibility Scanner

[david-allison]

LGTM