aisman

Session 144, Step 30: Verify subscription purchase/upgrade updates correctly via Paddle
- AIM-2674 Verify subscription purchase/upgrade updates correctly via Paddle

Outcome:
Fixed dialog dismissal, added Paddle subscription preview for exact pricing with tax.

Session 144, Step 31: Verify subscription purchase/upgrade updates correctly via Paddle
- AIM-2674 Verify subscription purchase/upgrade updates correctly via Paddle
- AIM-2709 Make default subscription tier configurable and subscribe at email confirmation

Outcome:
Fixed Paddle preview API (POST→PATCH), moved price preview into checkout pane, simplified confirm dialog, added configurable DefaultSubscriptionTierId, moved subscription creation to email confirmation and external login, removed dashboard auto-subscribe. Build succeeded with 0 errors.