fix: guard windows installer smoke exits

.github/workflows/release-tauri.yml

@@ -308,7 +308,13 @@ jobs:
           if (-not $nsis) { throw "NSIS installer not found." }
           if (-not $msi) { throw "MSI installer not found." }
           powershell.exe -NoProfile -ExecutionPolicy Bypass -File .\scripts\windows-ime-install-smoke.ps1 -InstallerPath $nsis.FullName -InstallerKind nsis
+          if ($LASTEXITCODE -ne 0) {
+            throw "NSIS installer smoke failed with exit $LASTEXITCODE"
+          }
           powershell.exe -NoProfile -ExecutionPolicy Bypass -File .\scripts\windows-ime-install-smoke.ps1 -InstallerPath $msi.FullName -InstallerKind msi
+          if ($LASTEXITCODE -ne 0) {
+            throw "MSI installer smoke failed with exit $LASTEXITCODE"
+          }
 
       # ── Linux：产 deb / rpm / AppImage ──
       - name: Build (Linux)