Copilot/implement csv support

[0fca]

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[0fca]

@copilot there is an issue with loading notes. I mean, I choose a note, its content replaces current one unpinned or there are some notes pinned and new note gets opened. Everything is ok, but still the toast for "Error loading note" appears even that there is no error. Check what can cause that issue.

[Copilot]

@copilot there is an issue with loading notes. I mean, I choose a note, its content replaces current one unpinned or there are some notes pinned and new note gets opened. Everything is ok, but...

Fixed in 75cf1da. The false toast was coming from stale note-load requests when opening/replacing an unpinned tab; the active editor still loaded the note correctly, but an older async load could fall into the generic error path. I added guards so only the latest live editor load can update state or show an error.