Bank Account Wizard Screen

Single screen that switches between three step UIs based on bankAccountControllerProvider.currentStep. Top progress bar reflects completedSteps. Each step has its own validation and submit button.

1. Step 1 (personal info): name, email, phone, DOB, address → submitPersonalInfo.
2. Step 2 (bank): account holder, account number, country, currency → submitBankDetails.
3. Step 3 (identity): pick or take a photo → submitIdentityVerification.
4. Completed state: shows 'Verified' or 'Pending review' card.

• submit errors render an inline banner with the _friendlyError message.
• Identity verification uses image_picker — gallery and camera both 2000×2000 max with quality 85.
• Validation is per-step; submitting with empty required fields keeps the user on the step.

• lib/src/features/seller/bank_account/views/bank_account_screen.dart

714 lines — a candidate for splitting into per-step widget files but works as-is.