feat: display app version in sidebar with GitHub release check

frontend/src/components/panels/Sidebar.tsx

@@ -5,6 +5,7 @@ import { Tooltip, TooltipContent, TooltipTrigger } from '@/components/ui/tooltip
 import { useCanvasStore } from '@/stores/canvasStore'
 import { scanApi, settingsApi } from '@/api/client'
 import { toast } from 'sonner'
+import { useLatestRelease } from '@/hooks/useLatestRelease'
 import { PendingDeviceModal, type PendingDevice } from '@/components/modals/PendingDeviceModal'
 
 const STANDALONE = import.meta.env.VITE_STANDALONE === 'true'
@@ -152,6 +153,8 @@ export function Sidebar({ onAddNode, onAddGroupRect, onScan, onSave, onNodeAppro
           />
         )}
       </div>
+
+      {!collapsed && <VersionBadge />}
     </aside>
   )
 }
@@ -548,6 +551,34 @@ function SettingsPanel() {
   )
 }
 
+function VersionBadge() {
+  const current = __APP_VERSION__
+  const { latest, hasUpdate } = useLatestRelease(current)
+
+  return (
+    <div className="px-3 py-2 border-t border-border flex flex-col gap-1">
+      <a
+        href={`https://github.com/Pouzor/homelable/releases/tag/v${current}`}
+        target="_blank"
+        rel="noopener noreferrer"
+        className="font-mono text-[11px] text-muted-foreground hover:text-foreground transition-colors"
+      >
+        v{current}
+      </a>
+      {hasUpdate && latest && (
+        <a
+          href={latest.url}
+          target="_blank"
+          rel="noopener noreferrer"
+          className="inline-flex items-center gap-1 px-1.5 py-0.5 rounded text-[10px] font-medium bg-[#e3b341]/15 text-[#e3b341] border border-[#e3b341]/30 hover:bg-[#e3b341]/25 transition-colors self-start"
+        >
+          ↑ v{latest.version} available
+        </a>
+      )}
+    </div>
+  )
+}
+
 const MAC_OUI: Record<string, { label: string; title: string }> = {
   '52:54:00': { label: 'QEMU', title: 'QEMU/KVM Virtual Machine' },
   'bc:24:11': { label: 'PVE',  title: 'Proxmox Virtual Machine or LXC' },

frontend/src/components/panels/__tests__/VersionBadge.test.tsx

@@ -0,0 +1,121 @@
+import { describe, it, expect, vi, beforeEach } from 'vitest'
+import { render, screen, waitFor } from '@testing-library/react'
+import { Sidebar } from '../Sidebar'
+import { useCanvasStore } from '@/stores/canvasStore'
+
+// ── Mocks ─────────────────────────────────────────────────────────────────────
+
+vi.mock('@/stores/canvasStore')
+
+vi.mock('@/api/client', () => ({
+  scanApi: {
+    trigger: vi.fn().mockResolvedValue({}),
+    pending: vi.fn().mockResolvedValue({ data: [] }),
+    hidden: vi.fn().mockResolvedValue({ data: [] }),
+    runs: vi.fn().mockResolvedValue({ data: [] }),
+    stop: vi.fn().mockResolvedValue({}),
+    getConfig: vi.fn().mockResolvedValue({ data: { ranges: [] } }),
+  },
+  settingsApi: {
+    get: vi.fn().mockResolvedValue({ data: { interval_seconds: 60 } }),
+    save: vi.fn().mockResolvedValue({}),
+  },
+}))
+
+vi.mock('sonner', () => ({ toast: { success: vi.fn(), error: vi.fn() } }))
+vi.mock('@/components/ui/Logo', () => ({ Logo: () => null }))
+vi.mock('@/components/ui/tooltip', () => ({
+  Tooltip: ({ children }: { children: React.ReactNode }) => <>{children}</>,
+  TooltipTrigger: ({ children }: { children: React.ReactNode }) => <>{children}</>,
+  TooltipContent: () => null,
+}))
+vi.mock('@/components/modals/PendingDeviceModal', () => ({ PendingDeviceModal: () => null }))
+vi.mock('@/components/modals/StatusTimelineModal', () => ({ StatusTimelineModal: () => null }))
+
+vi.mock('@/hooks/useLatestRelease', () => ({
+  useLatestRelease: vi.fn(),
+}))
+
+import { useLatestRelease } from '@/hooks/useLatestRelease'
+
+// ── Helpers ───────────────────────────────────────────────────────────────────
+
+function renderSidebar() {
+  vi.mocked(useCanvasStore).mockReturnValue({
+    nodes: [],
+    hasUnsavedChanges: false,
+    hideIp: false,
+    toggleHideIp: vi.fn(),
+    addNode: vi.fn(),
+    scanEventTs: 0,
+  } as unknown as ReturnType<typeof useCanvasStore>)
+
+  return render(
+    <Sidebar
+      onAddNode={vi.fn()}
+      onAddGroupRect={vi.fn()}
+      onScan={vi.fn()}
+      onSave={vi.fn()}
+      onNodeApproved={vi.fn()}
+    />,
+  )
+}
+
+// ── Tests ─────────────────────────────────────────────────────────────────────
+
+describe('VersionBadge', () => {
+  beforeEach(() => {
+    vi.mocked(useLatestRelease).mockReturnValue({ latest: null, hasUpdate: false })
+  })
+
+  it('displays the current app version', () => {
+    renderSidebar()
+    expect(screen.getByText(`v${__APP_VERSION__}`)).toBeInTheDocument()
+  })
+
+  it('links current version to its GitHub release page', () => {
+    renderSidebar()
+    const link = screen.getByText(`v${__APP_VERSION__}`).closest('a')
+    expect(link).toHaveAttribute(
+      'href',
+      `https://github.com/Pouzor/homelable/releases/tag/v${__APP_VERSION__}`,
+    )
+    expect(link).toHaveAttribute('target', '_blank')
+  })
+
+  it('does not show update badge when on latest version', () => {
+    renderSidebar()
+    expect(screen.queryByText(/available/)).not.toBeInTheDocument()
+  })
+
+  it('shows update badge when a newer version is available', async () => {
+    vi.mocked(useLatestRelease).mockReturnValue({
+      latest: { version: '9.9.9', url: 'https://github.com/Pouzor/homelable/releases/tag/v9.9.9' },
+      hasUpdate: true,
+    })
+    renderSidebar()
+    await waitFor(() => expect(screen.getByText('↑ v9.9.9 available')).toBeInTheDocument())
+  })
+
+  it('update badge links to the latest release URL', async () => {
+    vi.mocked(useLatestRelease).mockReturnValue({
+      latest: { version: '9.9.9', url: 'https://github.com/Pouzor/homelable/releases/tag/v9.9.9' },
+      hasUpdate: true,
+    })
+    renderSidebar()
+    await waitFor(() => {
+      const badge = screen.getByText('↑ v9.9.9 available').closest('a')
+      expect(badge).toHaveAttribute('href', 'https://github.com/Pouzor/homelable/releases/tag/v9.9.9')
+      expect(badge).toHaveAttribute('target', '_blank')
+    })
+  })
+
+  it('does not show update badge when hasUpdate is false even if latest exists', () => {
+    vi.mocked(useLatestRelease).mockReturnValue({
+      latest: { version: __APP_VERSION__, url: 'https://github.com' },
+      hasUpdate: false,
+    })
+    renderSidebar()
+    expect(screen.queryByText(/available/)).not.toBeInTheDocument()
+  })
+})