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/test/helpers.tsx

@@ -0,0 +1,34 @@
+import React from "react";
+import { QueryClient, QueryClientProvider } from "@tanstack/react-query";
+import { MemoryRouter, Routes, Route } from "react-router-dom";
+import { render } from "@testing-library/react";
+
+export function createTestQueryClient() {
+  return new QueryClient({
+    defaultOptions: {
+      queries: { retry: false, staleTime: 0 },
+      mutations: { retry: false },
+    },
+  });
+}
+
+interface RenderOptions {
+  path?: string;
+  route?: string;
+}
+
+export function renderWithProviders(
+  ui: React.ReactElement,
+  { path = "/", route = "/" }: RenderOptions = {}
+) {
+  const queryClient = createTestQueryClient();
+  return render(
+    <QueryClientProvider client={queryClient}>
+      <MemoryRouter initialEntries={[route]}>
+        <Routes>
+          <Route path={path} element={ui} />
+        </Routes>
+      </MemoryRouter>
+    </QueryClientProvider>
+  );
+}