Parent: #131. Depends on #316 and #317.
Complete guided drawing discovery and resume integration.
Acceptance:
- Project Library offers Guided Drawing beside normal project creation and clearly says it creates a separate project from an image.
- The existing secondary File menu entry remains available.
- Both entry points open the same setup flow, including workspace-limit handling.
- Reopening a saved mid-session project restores the target, settings, numbered palette, view defaults, and coverage from painted pixels.
- Closing or switching projects never implies completion.
Parent: #131. Depends on #316 and #317.
Complete guided drawing discovery and resume integration.
Acceptance: