feat(storybook): add one-click Windows launcher

start-storybook.bat

@@ -0,0 +1,24 @@
+@echo off
+setlocal EnableExtensions DisableDelayedExpansion
+chcp 65001 >nul
+title HMDesign - Storybook
+pushd "%~dp0"
+if errorlevel 1 goto root_error
+node scripts\start-storybook.mjs
+if errorlevel 1 goto fail
+popd
+endlocal
+exit /b 0
+:fail
+echo.
+echo ERROR: Storybook could not start. Review the error above.
+echo Check Node.js/npm, dependency installation, and port availability.
+popd
+pause
+endlocal
+exit /b 1
+:root_error
+echo ERROR: Cannot access the launcher folder.
+pause
+endlocal
+exit /b 1