- 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>