Replace the inline confirmation div at the bottom of Settings with a
proper full-screen view (view-delete-wallet-confirm). This fixes the
issue where the confirmation was offscreen on the 360x600 popup.
- New view with back button, title, warning text, password input,
and red-text Confirm Delete button
- Dedicated flash area for password errors
- New deleteWallet.js module with init/show pattern
- Added delete-wallet-confirm to VIEWS array in helpers.js
- Removed old inline confirmation HTML and logic from settings
