test: add coverage for drafts, soundPlayer, wslNotificationHelper, and costTrackingStore

src/lib/stores/drafts.test.ts

@@ -180,6 +180,16 @@ describe("draftsStore", () => {
       const result = draftsStore.formatTimestamp(invalid);
       expect(result).toBe(invalid);
     });
+
+    it("falls back to raw string when toLocaleString throws", () => {
+      const spy = vi.spyOn(Date.prototype, "toLocaleString").mockImplementation(() => {
+        throw new Error("Locale not supported");
+      });
+      const ts = "2026-01-15T14:30:00.000Z";
+      const result = draftsStore.formatTimestamp(ts);
+      expect(result).toBe(ts);
+      spy.mockRestore();
+    });
   });
 });