Move band management into dedicated settings pages

- Add BandSettingsPage (/bands/:id/settings/:panel) with Members,
  Storage, and Band Settings panels matching the mockup design
- Strip members list, invite controls, and NC folder config from
  BandPage — library view now focuses purely on recordings workflow
- Add band-scoped nav section to AppShell sidebar (Members, Storage,
  Band Settings) with correct per-panel active states
- Fix amAdmin bug: was checking if any member is admin; now correctly
  checks if the current user holds the admin role
- Add 31 vitest tests covering BandPage cleanliness, routing, access
  control (admin vs member), and per-panel mutation behaviour
- Add test:web, test:api:unit, test:feature (post-feature pipeline),
  and ci tasks to Taskfile; frontend tests run via podman node:20-alpine
- Add README with architecture overview, setup guide, and test docs
- Add @testing-library/dom and @testing-library/jest-dom to package.json

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

web/src/pages/BandPage.test.tsx

@@ -0,0 +1,97 @@
+import { describe, it, expect, vi, beforeEach } from "vitest";
+import { screen } from "@testing-library/react";
+import { renderWithProviders } from "../test/helpers";
+import { BandPage } from "./BandPage";
+
+// ── Mocks ─────────────────────────────────────────────────────────────────────
+
+vi.mock("../api/bands", () => ({
+  getBand: vi.fn().mockResolvedValue({
+    id: "band-1",
+    name: "Loud Hands",
+    slug: "loud-hands",
+    genre_tags: ["post-rock"],
+    nc_folder_path: null,
+  }),
+}));
+
+vi.mock("../api/client", () => ({
+  api: {
+    get: vi.fn().mockImplementation((url: string) => {
+      if (url.includes("/sessions")) {
+        return Promise.resolve([
+          { id: "s1", date: "2026-03-31", label: "Late Night Jam", recording_count: 3 },
+        ]);
+      }
+      if (url.includes("/songs/search")) {
+        return Promise.resolve([]);
+      }
+      return Promise.resolve([]);
+    }),
+    post: vi.fn(),
+    patch: vi.fn(),
+    delete: vi.fn(),
+  },
+  isLoggedIn: vi.fn().mockReturnValue(true),
+}));
+
+const renderBandPage = () =>
+  renderWithProviders(<BandPage />, {
+    path: "/bands/:bandId",
+    route: "/bands/band-1",
+  });
+
+// ── Tests ─────────────────────────────────────────────────────────────────────
+
+describe("BandPage — cleanliness (TC-01 to TC-07)", () => {
+  beforeEach(() => {
+    vi.clearAllMocks();
+  });
+
+  it("TC-01: does not render a member list", async () => {
+    renderBandPage();
+    // Allow queries to settle
+    await new Promise((r) => setTimeout(r, 50));
+    expect(screen.queryByText(/members/i)).toBeNull();
+  });
+
+  it("TC-02: does not render an invite button", async () => {
+    renderBandPage();
+    await new Promise((r) => setTimeout(r, 50));
+    expect(screen.queryByText(/\+ invite/i)).toBeNull();
+  });
+
+  it("TC-03: does not render the Nextcloud folder config widget", async () => {
+    renderBandPage();
+    await new Promise((r) => setTimeout(r, 50));
+    expect(screen.queryByText(/scan path/i)).toBeNull();
+    expect(screen.queryByText(/nextcloud scan folder/i)).toBeNull();
+  });
+
+  it("TC-04: renders sessions grouped by date", async () => {
+    renderBandPage();
+    // Sessions appear after the query resolves
+    const sessionEl = await screen.findByText("Late Night Jam");
+    expect(sessionEl).toBeTruthy();
+  });
+
+  it("TC-05: renders the Scan Nextcloud action button", async () => {
+    renderBandPage();
+    const btn = await screen.findByText(/scan nextcloud/i);
+    expect(btn).toBeTruthy();
+  });
+
+  it("TC-06: renders the + New Song button", async () => {
+    renderBandPage();
+    const btn = await screen.findByText(/\+ new song/i);
+    expect(btn).toBeTruthy();
+  });
+
+  it("TC-07: renders both By Date and Search tabs", async () => {
+    renderBandPage();
+    const byDate = await screen.findByText(/by date/i);
+    const search = await screen.findByText(/^search$/i);
+    expect(byDate).toBeTruthy();
+    expect(search).toBeTruthy();
+  });
+});