fix: eliminate Vite config and React act() warnings in tests

- Rename vitest.config.ts to .mts and replace __dirname with
  import.meta.dirname to resolve the Vite native configLoader warning
  about ESM syntax in a CJS-loaded file.

- Add explicit unmount() calls in useVscodeTheme tests so the
  MutationObserver-triggered state update from the afterEach cleanup
  doesn't fire while the component is still mounted, which caused
  'not wrapped in act()' warnings.

Author: EhabY

test/webview/ui/useVscodeTheme.test.ts

@@ -24,21 +24,23 @@ describe("useVscodeTheme", () => {
 	])("returns %s as %s", (attribute, expected) => {
 		setThemeKind(attribute);
 
-		const { result } = renderHook(() => useVscodeTheme());
+		const { result, unmount } = renderHook(() => useVscodeTheme());
 
 		expect(result.current).toBe(expected);
+		unmount();
 	});
 
 	it("defaults to dark when the attribute is missing", () => {
-		const { result } = renderHook(() => useVscodeTheme());
+		const { result, unmount } = renderHook(() => useVscodeTheme());
 
 		expect(result.current).toBe("dark");
+		unmount();
 	});
 
 	it("updates when the theme changes", async () => {
 		setThemeKind("vscode-dark");
 
-		const { result } = renderHook(() => useVscodeTheme());
+		const { result, unmount } = renderHook(() => useVscodeTheme());
 		expect(result.current).toBe("dark");
 
 		// MutationObserver callbacks are microtasks; flush them inside act.
@@ -47,5 +49,6 @@ describe("useVscodeTheme", () => {
 			await Promise.resolve();
 		});
 		expect(result.current).toBe("light");
+		unmount();
 	});
 });

vitest.config.ts vitest.config.mtsvitest.config.ts renamed to vitest.config.mts

@@ -2,7 +2,7 @@ import path from "node:path";
 import { defineConfig } from "vitest/config";
 
 const webviewSharedAlias = path.resolve(
-	__dirname,
+	import.meta.dirname,
 	"packages/webview-shared/src",
 );
 
@@ -24,9 +24,12 @@ export default defineConfig({
 				},
 				resolve: {
 					alias: {
-						"@": path.resolve(__dirname, "src"),
+						"@": path.resolve(import.meta.dirname, "src"),
 						"@repo/webview-shared": webviewSharedAlias,
-						vscode: path.resolve(__dirname, "test/mocks/vscode.runtime.ts"),
+						vscode: path.resolve(
+							import.meta.dirname,
+							"test/mocks/vscode.runtime.ts",
+						),
 					},
 				},
 			},
@@ -43,11 +46,17 @@ export default defineConfig({
 				resolve: {
 					alias: {
 						"@repo/webview-shared": webviewSharedAlias,
-						"@repo/tasks": path.resolve(__dirname, "packages/tasks/src"),
-						"@repo/ui": path.resolve(__dirname, "packages/ui/src"),
-						"@repo/netcheck": path.resolve(__dirname, "packages/netcheck/src"),
+						"@repo/tasks": path.resolve(
+							import.meta.dirname,
+							"packages/tasks/src",
+						),
+						"@repo/ui": path.resolve(import.meta.dirname, "packages/ui/src"),
+						"@repo/netcheck": path.resolve(
+							import.meta.dirname,
+							"packages/netcheck/src",
+						),
 						"@repo/speedtest": path.resolve(
-							__dirname,
+							import.meta.dirname,
 							"packages/speedtest/src",
 						),
 					},