fix: unified inbox swipe delete

[namelessweakl1ng]

Summary

Fixes an issue where swipe-to-delete in Unified Inbox only persisted for the first message deletion during an app session.

Previously:

• The first swipe deletion worked correctly.
• Subsequent swipe deletions temporarily removed messages from the UI, but the messages reappeared after restarting the app.
• Multi-select delete and swipe-delete in individual folders continued to work correctly.

Root Cause

The Unified Inbox swipe-delete flow was not correctly persisting state updates for subsequent delete operations within the same session.

Changes

• Updated the Unified Inbox delete handling to ensure every swipe action correctly persists message deletion state.
• Kept behavior consistent with existing delete flows used by individual folders and multi-select actions.
• Added/updated related logic to prevent stale message state from being restored after app restart.

Testing

Tested by:

1. Opening Unified Inbox
2. Swiping multiple consecutive messages to delete
3. Restarting the app
4. Verifying all swiped messages remained deleted

Also verified:

• Multi-select delete still works
• Swipe-delete in individual folders still works

Fixes #10998

AI Usage Disclosure

AI assistance tools were used to help navigate the repository structure, trace relevant code paths, and assist with implementation/debugging. All code changes were reviewed and validated manually before submission.

[github-actions]

✅ Validation Passed: All report and feature-flag labels are correctly set.

[wmontwe]

This doesn't appear to fix #10998. Or I can't reproduce it. I think the bug is related to the rapid swipe actions not triggering deleteMessages() while animating.

I'm working on test tooling that would allow to replicate the environment easily and then come back again to check this issue.