Hide console window, add Debug Window tray option

- Hide console window by default (windows_subsystem = "windows")
- Add "Show Debug Window" menu item to tray
- AllocConsole when debug window requested
- Console shows logs for troubleshooting

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

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

agent/src/session/mod.rs

@@ -6,11 +6,36 @@
 //! - Frame capture and encoding loop
 //! - Input event handling
 
+#[cfg(windows)]
+use windows::Win32::System::Console::{AllocConsole, GetConsoleWindow};
+#[cfg(windows)]
+use windows::Win32::UI::WindowsAndMessaging::{ShowWindow, SW_SHOW};
+
 use crate::capture::{self, Capturer, Display};
 use crate::chat::{ChatController, ChatMessage as ChatMsg};
 use crate::config::Config;
 use crate::encoder::{self, Encoder};
 use crate::input::InputController;
+
+/// Show the debug console window (Windows only)
+#[cfg(windows)]
+fn show_debug_console() {
+    unsafe {
+        let hwnd = GetConsoleWindow();
+        if hwnd.0 == std::ptr::null_mut() {
+            let _ = AllocConsole();
+            tracing::info!("Debug console window opened");
+        } else {
+            let _ = ShowWindow(hwnd, SW_SHOW);
+            tracing::info!("Debug console window shown");
+        }
+    }
+}
+
+#[cfg(not(windows))]
+fn show_debug_console() {
+    // No-op on non-Windows platforms
+}
 use crate::proto::{Message, message, ChatMessage};
 use crate::transport::WebSocketTransport;
 use crate::tray::{TrayController, TrayAction};
@@ -195,6 +220,9 @@ impl SessionManager {
                             // TODO: Show a details dialog
                             tracing::info!("User requested details (not yet implemented)");
                         }
+                        TrayAction::ShowDebugWindow => {
+                            show_debug_console();
+                        }
                     }
                 }