fix(cortex-tui): auto-redirect to login on session expiration (#226)

When the user's session has expired (remaining hours == 0), automatically
redirect them to the login screen instead of just showing a warning toast
that says 'Run /login to authenticate'.

This provides a better UX by removing the extra step of manually running
/login when the session has already expired.

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

Author: echobt

cortex-tui/src/runner/event_loop.rs

@@ -341,8 +341,8 @@ impl EventLoop {
         // Initial render
         self.render(terminal)?;
 
-        // Check token expiration and warn user if expiring soon
-        if let Ok(Some(auth)) = cortex_login::load_from_keyring() {
+        // Check token expiration and handle accordingly
+        let session_expired = if let Ok(Some(auth)) = cortex_login::load_from_keyring() {
             if auth.expires_soon(86400) {
                 // 24 hours
                 if let Some(remaining) = auth.time_until_expiry() {
@@ -352,13 +352,27 @@ impl EventLoop {
                             "Session expires in {} hours. Run /login to refresh.",
                             hours
                         ));
+                        false
                     } else {
-                        self.app_state
-                            .toasts
-                            .warning("Session expired. Run /login to authenticate.");
+                        // Session already expired - will trigger login flow
+                        true
                     }
+                } else {
+                    false
                 }
+            } else {
+                false
             }
+        } else {
+            false
+        };
+
+        // If session is expired, automatically redirect to login page
+        if session_expired {
+            self.app_state
+                .toasts
+                .warning("Session expired. Redirecting to login...");
+            self.start_login_flow().await;
         }
 
         // Main event loop: poll BOTH FrameEngine events AND streaming events