Scaffolding baseline

webui/src/App.css

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+.app {
+  max-width: 40rem;
+  margin: 4rem auto;
+  padding: 0 1.5rem;
+  font-family: 'IBM Plex Sans', 'Segoe UI', sans-serif;
+  color: #12263a;
+}
+
+.app h1 {
+  margin: 0 0 0.5rem;
+  font-size: 2.5rem;
+  letter-spacing: -0.03em;
+}
+
+.app p {
+  margin: 0 0 1.5rem;
+  line-height: 1.5;
+  color: #3a5166;
+}
+
+.app button {
+  appearance: none;
+  border: 1px solid #1f4b6e;
+  background: #1f4b6e;
+  color: #f7fafc;
+  padding: 0.65rem 1rem;
+  font: inherit;
+  cursor: pointer;
+}
+
+.app button:disabled {
+  opacity: 0.7;
+  cursor: wait;
+}
+
+.app button:not(:disabled):hover {
+  background: #16384f;
+}
+
+.app [role='status'],
+.app [role='alert'] {
+  margin-top: 1.25rem;
+}
+
+.app [role='alert'] {
+  color: #8a1c1c;
+}

webui/src/App.test.tsx

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+import { render, screen } from '@testing-library/react'
+import { describe, expect, it } from 'vitest'
+import App from './App'
+
+describe('App', () => {
+  it('renders the ClusterCanvas shell', () => {
+    render(<App />)
+
+    expect(
+      screen.getByRole('heading', { name: 'ClusterCanvas' }),
+    ).toBeInTheDocument()
+    expect(
+      screen.getByRole('button', { name: 'Check service health' }),
+    ).toBeInTheDocument()
+  })
+})

webui/src/App.tsx

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+import { useState } from 'react'
+import { fetchHealth } from './api/client'
+import './App.css'
+
+function App() {
+  const [healthStatus, setHealthStatus] = useState<string | null>(null)
+  const [errorMessage, setErrorMessage] = useState<string | null>(null)
+  const [isLoading, setIsLoading] = useState(false)
+
+  async function handleCheckHealth() {
+    setIsLoading(true)
+    setErrorMessage(null)
+    setHealthStatus(null)
+
+    try {
+      const health = await fetchHealth()
+      setHealthStatus(health.status)
+    } catch (error) {
+      const message =
+        error instanceof Error ? error.message : 'unknown health check error'
+      setErrorMessage(message)
+    } finally {
+      setIsLoading(false)
+    }
+  }
+
+  return (
+    <main className="app">
+      <h1>ClusterCanvas</h1>
+      <p>Dashboard for Proxmox VMs and LXC containers.</p>
+      <button type="button" onClick={handleCheckHealth} disabled={isLoading}>
+        {isLoading ? 'Checking…' : 'Check service health'}
+      </button>
+      {healthStatus ? (
+        <p role="status">Service health: {healthStatus}</p>
+      ) : null}
+      {errorMessage ? (
+        <p role="alert">Health check failed: {errorMessage}</p>
+      ) : null}
+    </main>
+  )
+}
+
+export default App

webui/src/api/client.test.ts

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+import { afterEach, describe, expect, it, vi } from 'vitest'
+import { fetchHealth, getApiBaseUrl } from './client'
+
+describe('getApiBaseUrl', () => {
+  it('defaults to localhost:8080 when unset', () => {
+    expect(getApiBaseUrl()).toBe('http://localhost:8080')
+  })
+})
+
+describe('fetchHealth', () => {
+  afterEach(() => {
+    vi.restoreAllMocks()
+  })
+
+  it('returns parsed health payload', async () => {
+    const fetchMock = vi.fn().mockResolvedValue({
+      ok: true,
+      json: async () => ({ status: 'ok' }),
+    })
+
+    const health = await fetchHealth(fetchMock)
+
+    expect(fetchMock).toHaveBeenCalledWith('http://localhost:8080/health')
+    expect(health).toEqual({ status: 'ok' })
+  })
+
+  it('throws when the response is not ok', async () => {
+    const fetchMock = vi.fn().mockResolvedValue({
+      ok: false,
+      status: 503,
+      json: async () => ({}),
+    })
+
+    await expect(fetchHealth(fetchMock)).rejects.toThrow(
+      'health check failed: 503',
+    )
+  })
+})

webui/src/api/client.ts

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+export type HealthResponse = {
+  status: string
+}
+
+export function getApiBaseUrl(): string {
+  return import.meta.env.VITE_API_BASE_URL ?? 'http://localhost:8080'
+}
+
+export async function fetchHealth(
+  fetchImpl: typeof fetch = fetch,
+): Promise<HealthResponse> {
+  const response = await fetchImpl(`${getApiBaseUrl()}/health`)
+  if (!response.ok) {
+    throw new Error(`health check failed: ${response.status}`)
+  }
+  return (await response.json()) as HealthResponse
+}

webui/src/assets/react.svg

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+<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" aria-hidden="true" role="img" class="iconify iconify--logos" width="35.93" height="32" preserveAspectRatio="xMidYMid meet" viewBox="0 0 256 228"><path fill="#00D8FF" d="M210.483 73.824a171.49 171.49 0 0 0-8.24-2.597c.465-1.9.893-3.777 1.273-5.621c6.238-30.281 2.16-54.676-11.769-62.708c-13.355-7.7-35.196.329-57.254 19.526a171.23 171.23 0 0 0-6.375 5.848a155.866 155.866 0 0 0-4.241-3.917C100.759 3.829 77.587-4.822 63.673 3.233C50.33 10.957 46.379 33.89 51.995 62.588a170.974 170.974 0 0 0 1.892 8.48c-3.28.932-6.445 1.924-9.474 2.98C17.309 83.498 0 98.307 0 113.668c0 15.865 18.582 31.778 46.812 41.427a145.52 145.52 0 0 0 6.921 2.165a167.467 167.467 0 0 0-2.01 9.138c-5.354 28.2-1.173 50.591 12.134 58.266c13.744 7.926 36.812-.22 59.273-19.855a145.567 145.567 0 0 0 5.342-4.923a168.064 168.064 0 0 0 6.92 6.314c21.758 18.722 43.246 26.282 56.54 18.586c13.731-7.949 18.194-32.003 12.4-61.268a145.016 145.016 0 0 0-1.535-6.842c1.62-.48 3.21-.974 4.76-1.488c29.348-9.723 48.443-25.443 48.443-41.52c0-15.417-17.868-30.326-45.517-39.844Zm-6.365 70.984c-1.4.463-2.836.91-4.3 1.345c-3.24-10.257-7.612-21.163-12.963-32.432c5.106-11 9.31-21.767 12.459-31.957c2.619.758 5.16 1.557 7.61 2.4c23.69 8.156 38.14 20.213 38.14 29.504c0 9.896-15.606 22.743-40.946 31.14Zm-10.514 20.834c2.562 12.94 2.927 24.64 1.23 33.787c-1.524 8.219-4.59 13.698-8.382 15.893c-8.067 4.67-25.32-1.4-43.927-17.412a156.726 156.726 0 0 1-6.437-5.87c7.214-7.889 14.423-17.06 21.459-27.246c12.376-1.098 24.068-2.894 34.671-5.345a134.17 134.17 0 0 1 1.386 6.193ZM87.276 214.515c-7.882 2.783-14.16 2.863-17.955.675c-8.075-4.657-11.432-22.636-6.853-46.752a156.923 156.923 0 0 1 1.869-8.499c10.486 2.32 22.093 3.988 34.498 4.994c7.084 9.967 14.501 19.128 21.976 27.15a134.668 134.668 0 0 1-4.877 4.492c-9.933 8.682-19.886 14.842-28.658 17.94ZM50.35 144.747c-12.483-4.267-22.792-9.812-29.858-15.863c-6.35-5.437-9.555-10.836-9.555-15.216c0-9.322 13.897-21.212 37.076-29.293c2.813-.98 5.757-1.905 8.812-2.773c3.204 10.42 7.406 21.315 12.477 32.332c-5.137 11.18-9.399 22.249-12.634 32.792a134.718 134.718 0 0 1-6.318-1.979Zm12.378-84.26c-4.811-24.587-1.616-43.134 6.425-47.789c8.564-4.958 27.502 2.111 47.463 19.835a144.318 144.318 0 0 1 3.841 3.545c-7.438 7.987-14.787 17.08-21.808 26.988c-12.04 1.116-23.565 2.908-34.161 5.309a160.342 160.342 0 0 1-1.76-7.887Zm110.427 27.268a347.8 347.8 0 0 0-7.785-12.803c8.168 1.033 15.994 2.404 23.343 4.08c-2.206 7.072-4.956 14.465-8.193 22.045a381.151 381.151 0 0 0-7.365-13.322Zm-45.032-43.861c5.044 5.465 10.096 11.566 15.065 18.186a322.04 322.04 0 0 0-30.257-.006c4.974-6.559 10.069-12.652 15.192-18.18ZM82.802 87.83a323.167 323.167 0 0 0-7.227 13.238c-3.184-7.553-5.909-14.98-8.134-22.152c7.304-1.634 15.093-2.97 23.209-3.984a321.524 321.524 0 0 0-7.848 12.897Zm8.081 65.352c-8.385-.936-16.291-2.203-23.593-3.793c2.26-7.3 5.045-14.885 8.298-22.6a321.187 321.187 0 0 0 7.257 13.246c2.594 4.48 5.28 8.868 8.038 13.147Zm37.542 31.03c-5.184-5.592-10.354-11.779-15.403-18.433c4.902.192 9.899.29 14.978.29c5.218 0 10.376-.117 15.453-.343c-4.985 6.774-10.018 12.97-15.028 18.486Zm52.198-57.817c3.422 7.8 6.306 15.345 8.596 22.52c-7.422 1.694-15.436 3.058-23.88 4.071a382.417 382.417 0 0 0 7.859-13.026a347.403 347.403 0 0 0 7.425-13.565Zm-16.898 8.101a358.557 358.557 0 0 1-12.281 19.815a329.4 329.4 0 0 1-23.444.823c-7.967 0-15.716-.248-23.178-.732a310.202 310.202 0 0 1-12.513-19.846h.001a307.41 307.41 0 0 1-10.923-20.627a310.278 310.278 0 0 1 10.89-20.637l-.001.001a307.318 307.318 0 0 1 12.413-19.761c7.613-.576 15.42-.876 23.31-.876H128c7.926 0 15.743.303 23.354.883a329.357 329.357 0 0 1 12.335 19.695a358.489 358.489 0 0 1 11.036 20.54a329.472 329.472 0 0 1-11 20.722Zm22.56-122.124c8.572 4.944 11.906 24.881 6.52 51.026c-.344 1.668-.73 3.367-1.15 5.09c-10.622-2.452-22.155-4.275-34.23-5.408c-7.034-10.017-14.323-19.124-21.64-27.008a160.789 160.789 0 0 1 5.888-5.4c18.9-16.447 36.564-22.941 44.612-18.3ZM128 90.808c12.625 0 22.86 10.235 22.86 22.86s-10.235 22.86-22.86 22.86s-22.86-10.235-22.86-22.86s10.235-22.86 22.86-22.86Z"></path></svg>

webui/src/index.css

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+:root {
+  color: #12263a;
+  background:
+    radial-gradient(circle at top left, #d7e7f2 0%, transparent 45%),
+    linear-gradient(180deg, #f4f8fb 0%, #e8eef3 100%);
+  font-family: 'IBM Plex Sans', 'Segoe UI', sans-serif;
+  font-synthesis: none;
+  text-rendering: optimizeLegibility;
+  -webkit-font-smoothing: antialiased;
+  -moz-osx-font-smoothing: grayscale;
+}
+
+* {
+  box-sizing: border-box;
+}
+
+body {
+  margin: 0;
+  min-height: 100vh;
+}
+
+#root {
+  min-height: 100vh;
+}

webui/src/main.tsx

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+import { StrictMode } from 'react'
+import { createRoot } from 'react-dom/client'
+import './index.css'
+import App from './App.tsx'
+
+createRoot(document.getElementById('root')!).render(
+  <StrictMode>
+    <App />
+  </StrictMode>,
+)

webui/src/test/setup.ts

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+import '@testing-library/jest-dom/vitest'

webui/src/vite-env.d.ts

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+/// <reference types="vite/client" />
+
+interface ImportMetaEnv {
+  readonly VITE_API_BASE_URL?: string
+}
+
+interface ImportMeta {
+  readonly env: ImportMetaEnv
+}