Workflow history branch 1

[jordanrfrazier]

I know this fixes a few critical issues - allowing save of an empty state, versions overwriting preview state of current draft, and restoring auto-save functionality. Not sure about all the frontend changes though.

Fix version restore overwriting with draft and harden sidebar lifecycle

  - Fix didRestore flag being immediately cleared by clearPreview(),
    which caused restore to silently revert to the current draft
  - Isolate each sidebar cleanup step in its own try-catch so a failure
    in one doesn't skip auto-save restoration
  - Clone flow before processFlows to prevent caller mutation
  - Split restore error handling into API phase (user-facing) and
    cleanup phase (logged only)
  - Guard against undefined nodes/edges in draft ref initialization
  - Remove empty-flow save guard that prevented saving after deleting
    the last node
  - Remove dead code: unused previewKey field, redundant clearPreview
    in SaveSnapshotButton

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