fix "No pinned messages" message

lib/widgets/pinned_events_drawer.dart

@@ -24,30 +24,28 @@ class PinnedEventsDrawer extends HookConsumerWidget {
         appBar: AppBar(
           scrolledUnderElevation: 0,
           leading: Icon(Icons.push_pin),
-          title: Text("Pinned Messages"),
+          title: Text("Pinned Events"),
           actionsPadding: .only(right: 4),
           actions: [
             IconButton(
               onPressed: Scaffold.of(context).closeEndDrawer,
               icon: Icon(Icons.close),
-              tooltip: "Close pinned messages",
+              tooltip: "Close pinned events",
             ),
           ],
         ),
         body: switch (pinsProvider) {
           AsyncData(:final value) when value.isEmpty => Center(
             child: Column(
+              mainAxisSize: .min,
               children: [
                 Icon(
                   Icons.push_pin_outlined,
                   size: 48,
-                  color: theme.colorScheme.surfaceContainerHigh,
+                  color: theme.colorScheme.onSurface,
                 ),
                 SizedBox(height: 12),
-                Text(
-                  "No pinned messages.",
-                  style: theme.textTheme.headlineSmall,
-                ),
+                Text("No pinned events", style: theme.textTheme.headlineSmall),
               ],
             ),
           ),