fix(ci): support Visual Studio 2026 native builds

.github/workflows/build.yml

@@ -39,8 +39,11 @@ jobs:
         shell: pwsh
         run: |
           npm run build:platform-native-helpers
+          if ($LASTEXITCODE -ne 0) { exit $LASTEXITCODE }
           npx tsc
+          if ($LASTEXITCODE -ne 0) { exit $LASTEXITCODE }
           npx vite build
+          if ($LASTEXITCODE -ne 0) { exit $LASTEXITCODE }
           npx electron-builder --win dir nsis --x64 --publish never
 
       - name: Smoke test packaged Windows paths

electron/windowsCmakeGenerators.test.mjs

@@ -0,0 +1,66 @@
+import { describe, expect, it, vi } from "vitest";
+
+import {
+	configureWithWindowsCmakeGenerator,
+	WINDOWS_CMAKE_GENERATORS,
+	WINDOWS_VISUAL_STUDIO_INSTALL_DIRS,
+} from "../scripts/windows-cmake-generators.mjs";
+
+describe("configureWithWindowsCmakeGenerator", () => {
+	it("uses Visual Studio 2026 first", () => {
+		const configure = vi.fn();
+		const clearCache = vi.fn();
+
+		const selected = configureWithWindowsCmakeGenerator({
+			prefix: "test",
+			configure,
+			clearCache,
+		});
+
+		expect(selected).toBe("Visual Studio 18 2026");
+		expect(WINDOWS_VISUAL_STUDIO_INSTALL_DIRS[0]).toBe("18");
+		expect(configure).toHaveBeenCalledWith("Visual Studio 18 2026", "v143");
+		expect(clearCache).toHaveBeenCalledTimes(1);
+	});
+
+	it("falls back in supported-version order and clears stale CMake state", () => {
+		const attempted = [];
+		const clearCache = vi.fn();
+		const log = vi.fn();
+
+		const selected = configureWithWindowsCmakeGenerator({
+			prefix: "test",
+			clearCache,
+			log,
+			configure: (generator, toolset) => {
+				attempted.push({ name: generator, toolset });
+				if (generator !== "Visual Studio 16 2019") {
+					throw new Error(`${generator} unavailable`);
+				}
+			},
+		});
+
+		expect(attempted).toEqual(
+			WINDOWS_CMAKE_GENERATORS.map(({ name, toolset }) => ({ name, toolset })),
+		);
+		expect(clearCache).toHaveBeenCalledTimes(3);
+		expect(log).toHaveBeenCalledTimes(2);
+		expect(selected).toBe("Visual Studio 16 2019");
+	});
+
+	it("rethrows the final configure error when no supported generator exists", () => {
+		const finalError = new Error("VS 2019 unavailable");
+
+		expect(() =>
+			configureWithWindowsCmakeGenerator({
+				prefix: "test",
+				clearCache: vi.fn(),
+				log: vi.fn(),
+				configure: (generator) => {
+					if (generator === "Visual Studio 16 2019") throw finalError;
+					throw new Error(`${generator} unavailable`);
+				},
+			}),
+		).toThrow(finalError);
+	});
+});