feat(mobile): Convert server address editing to modal in mobile app (#2290)

* feat: Convert server address editing to modal in mobile app

Changed the server address editing experience from an inline button to a modal dialog. This improves UX by forcing users to explicitly save or cancel their changes rather than forgetting to click a save button.

Changes:
- Created ServerAddressModal component following the CustomHeadersModal pattern
- Updated signin page to use the modal instead of inline editing
- Enhanced settings page to allow changing server address (was previously read-only)
- Added validation and error handling within the modal
- Made the settings page server address clickable with visual feedback

This resolves the issue where users forget to click the save button after editing the server address.

* refactor: Convert server address to screen modal

Changed from React Native Modal to Expo Router screen modal presentation.
This provides a better native experience with proper navigation stack integration.

Changes:
- Created server-address.tsx as a screen route with modal presentation
- Registered the route in root _layout.tsx
- Updated signin.tsx to navigate to the screen modal instead of opening RN modal
- Reverted settings page to original (no server address editing from settings)
- Removed ServerAddressModal component (no longer needed)

Benefits:
- Native modal presentation with proper animations
- Better integration with the navigation stack
- Cleaner separation of concerns

* merge the custom headers inside the server-add screen

* fix the look of the address UI

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Co-authored-by: Claude <noreply@anthropic.com>

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