Update dependencies, enhance API endpoints, and refactor UI components

- Updated `pubspec.lock` to new package versions for `async`, `fake_async`, `leak_tracker`, and `vm_service`.
- Modified API endpoint for unread notifications to include `event_type=PUSH`.
- Refactored `CompletionOfDocumentsMobilePage` layout for improved structure.
- Simplified `DetailDropDown` widget by removing unnecessary animations.
- Updated `CommentBox` styling and adjusted padding for better UI consistency.
- Replaced deprecated `FormCard` implementation in final completion pages with a new widget structure.
- Enhanced button styles across various dialogs and pages for a cohesive design.

lib/views/shared/select_submission_bottom_sheet.dart

@@ -27,7 +27,7 @@ class _SelectSubmissionBottomSheetState
         Container(
           width: double.infinity,
           // height: 272.0.h(),
-          padding: EdgeInsets.fromLTRB(24.0.w(), 24.0.h(), 24.0.w(), 33.0.h()),
+          padding: EdgeInsets.fromLTRB(24.0.w(), 12.0.h(), 24.0.w(), 33.0.h()),
           decoration: BoxDecoration(
             color: AppColors.backgroundColor,
             borderRadius: const BorderRadius.only(
@@ -37,6 +37,15 @@ class _SelectSubmissionBottomSheetState
           ),
           child: Column(
             children: [
+              Align(
+                alignment: AlignmentDirectional.centerStart,
+                child: IconButton(
+                  onPressed: () {
+                    context.pop();
+                  },
+                  icon: const Icon(Icons.close),
+                ),
+              ),
               Text(
                 CommonStrings.selectSubmission,
                 style: TextStyle(