profiles: add address management, user edit, fix form redirect

- Add type (Mailing/Billing/Shipping) and isDefault fields to Address
  schema with migration. Unique default enforced server-side.
- Rewrite profiles page with inline address creation form and
  editable user name/email within the profile modal.
- Add upsertAddress and updateUser form actions.
- Fix form redirect by adding use:enhance to AdminForm.
- Disable Update button in AdminForm until a field is changed
  (prevents accidental submissions).

prisma/migrations/20260707181820_profiles_address_type_default/migration.sql

@@ -0,0 +1,3 @@
+-- AlterTable
+ALTER TABLE "Address" ADD COLUMN     "isDefault" BOOLEAN NOT NULL DEFAULT false,
+ADD COLUMN     "type" TEXT NOT NULL DEFAULT 'Mailing';