Auto-save drafts in note input before generation

Description: When I type or dictate text in the session note input before hitting "generate note," the draft disappears if I navigate away or refresh the page. It would be helpful to auto-save that draft text so I don't lose work in progress.

Use case: I often compose notes in stages, step away to check something, or accidentally refresh. Being able to return to an in-progress draft would reduce rework and frustration.