Handle concatenated JSON responses in RPC parsing

Fix edge case where server returns multiple concatenated JSON objects
due to HTTP connection issues. Extract and parse only the first object.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <[email protected]>

Author: johankristianss

src/rpc.rs

@@ -1221,7 +1221,15 @@ pub(super) async fn send_rpcmsg(msg: String) -> Result<String, RPCError> {
         Err(err) => return Err(RPCError::new(&err.to_string(), false)),
     };
 
-    let rpc_reply: RPCReplyMsg = serde_json::from_str(body.as_str())
+    // Handle edge case where server returns multiple concatenated JSON objects
+    // This can happen due to HTTP connection issues - extract just the first object
+    let body_to_parse = if body.contains("}{") {
+        body.split("}{").next().map(|s| format!("{}}}", s)).unwrap_or(body.clone())
+    } else {
+        body.clone()
+    };
+
+    let rpc_reply: RPCReplyMsg = serde_json::from_str(body_to_parse.as_str())
         .map_err(|e| RPCError::new(&format!("Failed to parse response: {} - body: {}", e, body), false))?;
     let buf = BASE64.decode(rpc_reply.payload.as_str())
         .map_err(|e| RPCError::new(&format!("Failed to decode payload: {}", e), false))?;