feat: redesign account page — compact Firezone-style layout

- Remove tabbed layout, stack all sections vertically
- Compact key-value rows for user details
- Dense bordered tables for API tokens and MFA methods
- Consistent button styling with proper padding (BTN_PRIMARY/OUTLINE/DANGER)
- Token creation with inline copy-to-clipboard banner
- TOTP registration with compact inline QR + form
- Danger zone with typed-email confirmation dialog
- Add .idea and .coverage to gitignore
- Fix CI: add node:20-slim container to release job
- Fix connectivity check URL to Cloudflare endpoint

.gitignore

@@ -4,3 +4,5 @@ __pycache__/
 .env
 .nicegui/
 logs/
+.idea/
+.coverage