fix(chat): allow empty poke messages

apps/chanora_flutter/lib/widgets/chat_views.dart

@@ -15,6 +15,12 @@ const double _chatSidebarTileExtent = 92;
 const double _chatSidebarCompactTileExtent = 76;
 const double _chatSidebarCompactHeight = 84;
 
+typedef ChatMessageSender =
+    Future<void> Function({
+      required String message,
+      required rust.BridgeMessageTarget target,
+    });
+
 /// One chat/activity message shown in the chat hub.
 class ChatEntry {
   /// Construct a chat entry.
@@ -497,7 +503,7 @@ String chatInputPlaceholder(
     case rust.BridgeMessageTarget_Client():
       return 'Message $clientName...';
     case rust.BridgeMessageTarget_Poke():
-      return 'Poke message...';
+      return 'Poke message optional...';
   }
 }
 
@@ -513,6 +519,16 @@ bool canSendToChatTarget(
   }
 }
 
+bool canSendChatMessage(
+  rust.BridgeMessageTarget target,
+  BigInt? currentChannelId,
+  String text,
+) {
+  if (!canSendToChatTarget(target, currentChannelId)) return false;
+  if (target is rust.BridgeMessageTarget_Poke) return true;
+  return text.trim().isNotEmpty;
+}
+
 String? chatSendBlockedReason(
   rust.BridgeMessageTarget target,
   BigInt? currentChannelId,
@@ -1066,6 +1082,7 @@ class ChatDetailView extends StatefulWidget {
     this.messageMaxWidth,
     this.restoredDraft,
     this.onDraftChanged,
+    this.sendChatMessage,
   });
 
   /// Chat target displayed by this detail view.
@@ -1101,6 +1118,9 @@ class ChatDetailView extends StatefulWidget {
   /// Called with the current draft text whenever the target changes or the widget is about to be replaced.
   final ValueChanged<String>? onDraftChanged;
 
+  /// Sends a chat message. Defaults to the Rust bridge send path.
+  final ChatMessageSender? sendChatMessage;
+
   @override
   State<ChatDetailView> createState() => _ChatDetailViewState();
 }
@@ -1168,9 +1188,12 @@ class _ChatDetailViewState extends State<ChatDetailView> {
 
   void _send() {
     final text = _textCtl.text.trim();
-    if (text.isEmpty || !_canSend) return;
+    if (!canSendChatMessage(widget.target, widget.currentChannelId, text)) {
+      return;
+    }
     _textCtl.clear();
-    unawaited(rust.sendChatMessage(message: text, target: widget.target));
+    final sendChatMessage = widget.sendChatMessage ?? rust.sendChatMessage;
+    unawaited(sendChatMessage(message: text, target: widget.target));
     final ownId = widget.snapshot.ownClientId;
     setState(() {
       widget.messages.add(
@@ -1223,6 +1246,9 @@ class _ChatDetailViewState extends State<ChatDetailView> {
       channelName: widget.channelName,
       clientName: widget.clientName,
     );
+    final sendTooltip = widget.target is rust.BridgeMessageTarget_Poke
+        ? 'Poke'
+        : 'Send';
 
     return Column(
       children: [
@@ -1332,7 +1358,7 @@ class _ChatDetailViewState extends State<ChatDetailView> {
                 IconButton.filled(
                   icon: const Icon(Icons.send),
                   onPressed: _send,
-                  tooltip: 'Send',
+                  tooltip: sendTooltip,
                 ),
               ],
             ),