feat: add unit tests (Rust parser+DB, Vitest frontend) and test workflow

src/__tests__/HomeView.test.tsx

@@ -0,0 +1,54 @@
+import { describe, it, expect, vi, beforeEach } from "vitest";
+import { render, screen } from "@testing-library/react";
+import userEvent from "@testing-library/user-event";
+import HomeView from "../components/HomeView";
+
+// État minimal du store pour que HomeView ne plante pas
+const baseStoreState = {
+  guides: [],
+  profiles: [],
+  activeProfileId: null,
+  syncing: false,
+  openGuide: vi.fn(),
+};
+
+vi.mock("../store", () => ({
+  useStore: vi.fn((selector?: (s: unknown) => unknown) => {
+    return typeof selector === "function"
+      ? selector(baseStoreState)
+      : baseStoreState;
+  }),
+}));
+
+describe("HomeView", () => {
+  beforeEach(() => {
+    vi.clearAllMocks();
+  });
+
+  it('ne montre pas la bannière "Première utilisation" sans needsSync', () => {
+    render(<HomeView />);
+    expect(screen.queryByText("Première utilisation")).not.toBeInTheDocument();
+  });
+
+  it('affiche la bannière "Première utilisation" quand needsSync est true', () => {
+    render(<HomeView needsSync={true} />);
+    expect(screen.getByText("Première utilisation")).toBeInTheDocument();
+  });
+
+  it('affiche le bouton "Synchroniser les guides" quand needsSync est true', () => {
+    render(<HomeView needsSync={true} onSync={vi.fn()} />);
+    expect(
+      screen.getByRole("button", { name: /Synchroniser les guides/i })
+    ).toBeInTheDocument();
+  });
+
+  it("appelle onSync au clic sur le bouton de synchronisation", async () => {
+    const user = userEvent.setup();
+    const onSync = vi.fn();
+    render(<HomeView needsSync={true} onSync={onSync} />);
+
+    await user.click(screen.getByRole("button", { name: /Synchroniser les guides/i }));
+
+    expect(onSync).toHaveBeenCalledOnce();
+  });
+});