Embed mode (?embed=1 or iframe detection):
- Shows sleek mini card (Make a Pledge) instead of full step 1
- 160px at rest, expands to 700px when user starts the flow
- postMessage resize signal for parent iframe auto-height
- Powered-by footer
Back button:
- Moved from hidden bottom bar to fixed top navigation bar
- ChevronLeft + "Back" text, always visible during backable steps
- Org name centered in header, step label on right
- Progress bar integrated into top bar
Embed code updated:
- iframe starts at height=160 (mini widget height)
- Includes resize listener script for auto-expansion
