chore: add informative messages to Windows build script

Add echo statements at key build steps to indicate progress:
- Build start and version info
- Output path
- Environment setup
- Icon resource embedding (or warning if windres not found)
- Go compilation
- Success completion message

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

scripts/build-windows.bat

@@ -6,21 +6,28 @@ REM directory. Move to the repository root (the parent of scripts\) before using
 REM relative paths such as .\cmd\gosentry and packaging\windows\gosentry.rc.
 cd /d "%~dp0\.."
 
+echo [GoSentry Windows Build]
+echo.
+
 for /f "tokens=4" %%V in ('findstr /C:"var Version" src\app\version.go') do set "VERSION=%%~V"
 if "%VERSION%"=="" set "VERSION=0.0.0-dev"
 set "VERSION=%VERSION:"=%"
+echo Version: %VERSION%
 
 REM Optional first argument allows CI or a developer to choose another output
 REM path. The default keeps all generated binaries under dist\ so the source tree
 REM stays clean and the old bin\ folder is no longer needed.
 set "OUTPUT=%~1"
 if "%OUTPUT%"=="" set "OUTPUT=dist\windows\gosentry-%VERSION%-windows-amd64.exe"
+echo Output: %OUTPUT%
+echo.
 
 REM Prefer the standard Go installer path on Windows, but fall back to PATH for
 REM machines where Go was installed by another package manager.
 set "GOEXE=%ProgramFiles%\Go\bin\go.exe"
 if not exist "%GOEXE%" set "GOEXE=go"
 
+echo Setting up build environment...
 REM Fyne uses native libraries through CGO. MSYS2 UCRT64 provides the GCC toolchain
 REM expected by the Windows build; prepending it keeps the script self-contained
 REM without permanently changing the user's system PATH.
@@ -41,15 +48,23 @@ REM shortcuts, and the taskbar can show the GoSentry icon. The Go embed package
 REM handles Fyne's runtime icon, but Explorer reads this Windows resource instead.
 where windres.exe >nul 2>nul
 if %ERRORLEVEL%==0 (
+    echo Embedding Windows icon resource...
     windres.exe -O coff -o cmd\gosentry\rsrc_windows_amd64.syso packaging\windows\gosentry.rc
+) else (
+    echo Warning: windres not found; Windows icon resource will not be embedded.
 )
 
 REM -trimpath removes local machine paths from the binary, -s -w reduce binary
 REM size, and -H=windowsgui prevents a separate console window from opening when
 REM the GUI app starts from Explorer or a shortcut.
+echo Compiling Go binary...
 "%GOEXE%" build -trimpath -ldflags "-s -w -H=windowsgui -X gitea.mixdep.ru/mix/gosentry/src/app.Version=%VERSION%" -o "%OUTPUT%" .\cmd\gosentry
-if errorlevel 1 exit /b 1
+if errorlevel 1 (
+    echo Build failed with error code %ERRORLEVEL%
+    exit /b 1
+)
 
 REM Icons are embedded into the executable, so no assets directory is copied next
 REM to the binary. Runtime YAML and log files are created by the app itself.
-echo Built %OUTPUT%
+echo.
+echo Successfully built: %OUTPUT%