add timesheet unit and e2e tests; add unit test CI setup

resources/js/test-setup.ts

@@ -0,0 +1,20 @@
+// Vitest setup file. Wires up the globals that the production code reads
+// off `window` (`getTimezoneSetting`, `getWeekStartSetting`, `getNumberFormat`,
+// `getIntervalFormat`) so that helpers under test don't crash when imported
+// outside the running app.
+
+import { vi } from 'vitest';
+
+declare global {
+    interface Window {
+        getTimezoneSetting: () => string;
+        getWeekStartSetting: () => string;
+        getNumberFormat: () => string;
+        getIntervalFormat: () => string;
+    }
+}
+
+window.getTimezoneSetting = vi.fn(() => 'UTC');
+window.getWeekStartSetting = vi.fn(() => 'monday');
+window.getNumberFormat = vi.fn(() => 'point');
+window.getIntervalFormat = vi.fn(() => 'hours-minutes');