Add Multi-Select and Select-All for Notes

On iOS, I can long-press a note to enter multi-select mode, allowing me to delete multiple notes at once.

However, this feature is not available on the desktop version. As a result, when I want to delete several notes, the workload is more than three times what it is on my phone. I have to open each note individually, click "More," then "Move to Trash," and only then can I delete a single note. When I need to delete multiple notes, I have to repeat this process over and over.

The issue does not name files or tests. Start by locating the desktop note list and its existing single-note deletion flow, then compare the requested behavior with the iOS multi-select flow described here. Done means users can select multiple notes, select all notes, and delete the selected notes without opening them individually.

Written by the indexing model from the issue text.