feat: enhance mobile responsiveness across calendar and contact components

- Added `isMobile` prop to `CalendarWeekView`, `EventDetailPopover`, `ContactDetail`, `ContactGroupDetail`, and `EmailComposer` components for improved mobile layout.
- Adjusted layout and styles in `CalendarWeekView` to display a 3-day view on mobile.
- Updated `EventDetailPopover` to adapt its size and layout for mobile devices.
- Modified `ContactDetail` and `ContactGroupDetail` to adjust padding and font sizes based on mobile view.
- Enhanced `EmailComposer` with mobile-friendly header and field layouts, including auto-saving draft functionality.
- Added confirmation dialog for unsaved changes when closing the email composer.
- Updated localization files to include new strings for draft management.

locales/en/common.json

@@ -331,7 +331,11 @@
     "upload_progress": "Uploading {uploaded} / {total}",
     "upload_cancel": "Cancel upload",
     "upload_failed": "Failed to upload {filename}",
-    "send_failed": "Failed to send email"
+    "send_failed": "Failed to send email",
+    "continue_draft": "Continue draft",
+    "close_draft_title": "Save or discard draft?",
+    "close_draft_message": "You have unsaved changes. Would you like to save this as a draft or discard it?",
+    "save_draft": "Save Draft"
   },
   "confirm_dialog": {
     "confirm": "Confirm",