custom login implementation, period-based timetable layout with overlap handling, enhanced error dialogs, and unified bottom sheets

lib/state/app/infrastructure/loadable_state/view/loadable_state_error_bar.dart

@@ -55,7 +55,7 @@ class LoadableStateErrorBar extends StatelessWidget {
                         if (technicalDetails != null && technicalDetails!.isNotEmpty) technicalDetails!,
                       ].join('\n\n');
                       if (body.isEmpty) return;
-                      InfoDialog.show(context, body);
+                      InfoDialog.show(context, body, copyable: true, title: 'Fehlerdetails');
                     },
                     child: Container(
                       height: 20,

lib/state/app/infrastructure/loadable_state/view/loadable_state_error_screen.dart

@@ -58,7 +58,7 @@ class LoadableStateErrorScreen extends StatelessWidget {
               if (technicalDetails != null) ...[
                 const SizedBox(height: 4),
                 TextButton(
-                  onPressed: () => InfoDialog.show(context, technicalDetails!),
+                  onPressed: () => InfoDialog.show(context, technicalDetails!, copyable: true, title: 'Fehlerdetails'),
                   child: const Text('Details anzeigen'),
                 ),
               ],