Improve Windows installer, shortcuts, GUI reliability, and README

install_windows.bat

@@ -0,0 +1,16 @@
+@echo off
+REM Journey FM Playlist Creator - Windows Installer Launcher
+
+cd /d "%~dp0"
+
+powershell -NoProfile -ExecutionPolicy Bypass -File "%~dp0install_windows.ps1"
+if errorlevel 1 (
+  echo.
+  echo Installation failed. See output above for details.
+  pause
+  exit /b 1
+)
+
+echo.
+echo Installation finished successfully.
+pause