fix: accurate port banner and tkinter graceful fallback

- Move startup banner into main.py so it shows the actual configured
  port instead of a hardcoded 8080 in the launcher scripts
- Wrap tkinter import in try/except so embedded Python (which lacks
  tkinter) logs a warning instead of crashing the overlay thread

build-dist-windows.sh

@@ -243,22 +243,11 @@ cd /d "%~dp0"
 set PYTHONPATH=%~dp0app\src
 set WLED_CONFIG_PATH=%~dp0app\config\default_config.yaml
 
-:: Read port from env var or use default
-if "%WLED_SERVER__PORT%"=="" set WLED_SERVER__PORT=8080
-
 :: Create data directory if missing
 if not exist "%~dp0data" mkdir "%~dp0data"
 if not exist "%~dp0logs" mkdir "%~dp0logs"
 
-echo.
-echo  =============================================
-echo   LedGrab v${VERSION_CLEAN}
-echo   Open http://localhost:%WLED_SERVER__PORT% in your browser
-echo  =============================================
-echo.
-
-:: Start the server — uses config from WLED_CONFIG_PATH, port from config or env
-start "" /b cmd /c "timeout /t 2 /nobreak >nul && start http://localhost:%WLED_SERVER__PORT%"
+:: Start the server — reads port from config, prints its own banner
 "%~dp0python\python.exe" -m wled_controller.main
 
 pause