fix(tui): change 'Starting...' to 'Processing request...' for subagent status (#291)

Co-authored-by: Droid Agent <droid@factory.ai>

Author: echobt

cortex-tui/src/app.rs

@@ -322,7 +322,7 @@ impl SubagentDisplayStatus {
     /// Get a short description of the status.
     pub fn description(&self) -> String {
         match self {
-            Self::Starting => "Starting...".to_string(),
+            Self::Starting => "Processing request...".to_string(),
             Self::Thinking => "Thinking...".to_string(),
             Self::ExecutingTool(name) => format!("Running {}", name),
             Self::Completed => "Completed".to_string(),