feat: Integrate sync status indicators in app title bar and home screen

lib/widgets/app_title_bar_io.dart

@@ -1,18 +1,12 @@
 import 'package:flutter/material.dart';
 import 'package:notas/platform/app_platform.dart';
-import 'package:notas/widgets/sync_status_indicator.dart';
 import 'package:window_manager/window_manager.dart';
 
 class AppTitleBar extends StatelessWidget {
   const AppTitleBar({
-    this.syncStatus = SyncStatus.idle,
-    this.syncErrorMessage,
     super.key,
   });
 
-  final SyncStatus syncStatus;
-  final String? syncErrorMessage;
-
   @override
   Widget build(BuildContext context) {
     if (isAndroid || isIOS) {
@@ -30,11 +24,6 @@ class AppTitleBar extends StatelessWidget {
                 'Mis Notas',
                 style: TextStyle(color: Colors.white70, fontSize: 13),
               ),
-              const SizedBox(width: 8),
-              SyncStatusIndicator(
-                status: syncStatus,
-                errorMessage: syncErrorMessage,
-              ),
             ],
           ),
         ),
@@ -42,10 +31,7 @@ class AppTitleBar extends StatelessWidget {
     }
 
     if (isLinux) {
-      return _KdeTitleBar(
-        syncStatus: syncStatus,
-        syncErrorMessage: syncErrorMessage,
-      );
+      return const _KdeTitleBar();
     }
 
     return SizedBox(
@@ -56,11 +42,6 @@ class AppTitleBar extends StatelessWidget {
           mainAxisSize: MainAxisSize.min,
           children: [
             const Text('Mis Notas', style: TextStyle(color: Colors.white)),
-            const SizedBox(width: 8),
-            SyncStatusIndicator(
-              status: syncStatus,
-              errorMessage: syncErrorMessage,
-            ),
           ],
         ),
       ),
@@ -69,13 +50,7 @@ class AppTitleBar extends StatelessWidget {
 }
 
 class _KdeTitleBar extends StatefulWidget {
-  const _KdeTitleBar({
-    this.syncStatus = SyncStatus.idle,
-    this.syncErrorMessage,
-  });
-
-  final SyncStatus syncStatus;
-  final String? syncErrorMessage;
+  const _KdeTitleBar();
 
   @override
   State<_KdeTitleBar> createState() => _KdeTitleBarState();
@@ -182,22 +157,6 @@ class _KdeTitleBarState extends State<_KdeTitleBar> with WindowListener {
                 ),
               ),
             ),
-            Positioned(
-              left: 0,
-              top: 0,
-              bottom: 0,
-              child: IgnorePointer(
-                child: Padding(
-                  padding: const EdgeInsets.symmetric(horizontal: 8),
-                  child: Center(
-                    child: SyncStatusIndicator(
-                      status: widget.syncStatus,
-                      errorMessage: widget.syncErrorMessage,
-                    ),
-                  ),
-                ),
-              ),
-            ),
             Positioned(
               right: 0,
               top: 0,

lib/widgets/search_app_bar.dart

@@ -7,6 +7,8 @@ class SearchAppBar extends StatefulWidget {
     this.onLeadingPressed,
     this.leadingIcon = Icons.menu,
     this.leadingTooltip = 'Menú',
+    this.leadingWidget,
+    this.trailingWidget,
     this.onSearchChanged,
     this.searchHint = 'Buscar notas...',
     this.showSearch = true,
@@ -17,6 +19,8 @@ class SearchAppBar extends StatefulWidget {
   final VoidCallback? onLeadingPressed;
   final IconData leadingIcon;
   final String leadingTooltip;
+  final Widget? leadingWidget;
+  final Widget? trailingWidget;
   final ValueChanged<String>? onSearchChanged;
   final String searchHint;
   final bool showSearch;
@@ -67,6 +71,10 @@ class _SearchAppBarState extends State<SearchAppBar> {
             splashRadius: 18,
             constraints: const BoxConstraints(minWidth: 40, minHeight: 40),
           ),
+          if (widget.leadingWidget != null) ...[
+            const SizedBox(width: 8),
+            Center(child: widget.leadingWidget!),
+          ],
           const SizedBox(width: 8),
           Expanded(
             child: widget.showSearch
@@ -151,6 +159,10 @@ class _SearchAppBarState extends State<SearchAppBar> {
                     ),
                   ),
           ),
+          if (widget.trailingWidget != null) ...[
+            const SizedBox(width: 8),
+            Center(child: widget.trailingWidget!),
+          ],
         ],
       ),
     );

lib/widgets/sync_status_indicator.dart

@@ -21,7 +21,14 @@ class SyncStatusIndicator extends StatelessWidget {
   Widget build(BuildContext context) {
     switch (status) {
       case SyncStatus.idle:
-        return const SizedBox.shrink();
+        return const Tooltip(
+          message: 'Sincronización en espera',
+          child: Icon(
+            Icons.cloud_outlined,
+            size: 16,
+            color: Colors.white38,
+          ),
+        );
 
       case SyncStatus.syncing:
         return const Tooltip(