- After generation, toolbar shows "Save to Flow Library" button
(replaces "Import to Editor")
- Button shows "Saving..." spinner state during API call
- Generate button shows animated spinner during generation
- Backend /import endpoint always creates a new Tree record
(removed generated_tree_id idempotency check)
- Navigates to tree editor after successful save
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>