debug: add logging to diagnose chat protocol issue

Add console logging to:
- chat command argParser to see input args and parsed result
- ChatViewer to see received props

This will help diagnose why 'undefined protocol' error appears
when opening chat via command or event menu.

src/components/ChatViewer.tsx

@@ -437,6 +437,10 @@ export function ChatViewer({
   customTitle,
   headerPrefix,
 }: ChatViewerProps) {
+  console.log("[ChatViewer] Received props:", {
+    protocol,
+    identifier: identifier?.type,
+  });
   const { addWindow } = useGrimoire();
 
   // Get active account with signing capability

src/types/man.ts

@@ -580,7 +580,12 @@ export const manPages: Record<string, ManPageEntry> = {
     appId: "chat",
     category: "Nostr",
     argParser: async (args: string[]) => {
+      console.log("[chat argParser] Input args:", args);
       const result = parseChatCommand(args);
+      console.log("[chat argParser] Parsed result:", {
+        protocol: result.protocol,
+        identifier: result.identifier,
+      });
       return {
         protocol: result.protocol,
         identifier: result.identifier,