feat(demo): black-theme app UIs w/ icons, real ElectrumX UI, Core/Knots split

- Mock app UIs (ElectrumX, LND, Fedimint, Bitcoin Core) + the "Not available"
  notice now use the Archipelago black theme and show the app's My-Apps icon.
- Bitcoin Core gets its own UI (/app/bitcoin-core/) so it no longer shows Bitcoin
  Knots branding; the Knots-branded bitcoin-ui shell is reserved for Bitcoin Knots.
- ElectrumX now serves the real electrs-ui shell (+ qrcode.js + a dummy
  /electrs-status) with the correct ElectrumX icon; "Electrs" renamed to ElectrumX.
- My Apps: pre-install Bitcoin Knots again, drop ThunderHub, rename Electrs→ElectrumX.
- App store no longer shows "Checking…" forever in demo — non-demoable apps show
  "No demo" immediately (skip the container-scan state).
- Relay endpoint no longer reveals a real domain (randomised host).
- Dockerfile/.dockerignore copy docker/electrs-ui into the backend image.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

.dockerignore

@@ -7,10 +7,11 @@
 # Allow demo assets (AIUI pre-built dist)
 !demo/
 
-# Allow the Bitcoin UI mock shell (backend serves it from /docker/bitcoin-ui)
+# Allow the Bitcoin UI + ElectrumX UI mock shells (served from /docker/*)
 !docker/
 docker/*
 !docker/bitcoin-ui/
+!docker/electrs-ui/
 
 # Allow backend source for ISO source builds
 !core/

neode-ui/Dockerfile.backend

@@ -17,6 +17,7 @@ COPY neode-ui/ ./
 # Sibling assets the mock backend reads relative to /app (../docker, ../demo):
 # the Bitcoin UI mock shell and any curated cloud files dropped into demo/files.
 COPY docker/bitcoin-ui /docker/bitcoin-ui
+COPY docker/electrs-ui /docker/electrs-ui
 COPY demo/files /demo/files
 
 # Expose port

neode-ui/docker/nginx-demo.conf

@@ -62,6 +62,14 @@ http {
             proxy_set_header X-Real-IP $remote_addr;
         }
 
+        # ElectrumX UI status (polled by the electrs-ui shell)
+        location /electrs-status {
+            proxy_pass http://neode-backend:5959;
+            proxy_http_version 1.1;
+            proxy_set_header Host $host;
+            proxy_set_header X-Real-IP $remote_addr;
+        }
+
         # Proxy FileBrowser API to mock backend (demo mode)
         location /app/filebrowser/ {
             client_max_body_size 10G;

neode-ui/mock-backend.js

@@ -150,7 +150,7 @@ const SEED_BTCRELAY = {
     allow_tor: true,
     selected_peer_pubkey: '03d9b8a8db6b4f4d8b8d04c7a467c101f04c0ecbabc0e29e4dcb812a3b1c5f8f04',
     http_endpoint: '',
-    https_endpoint: 'https://shard.tx1138.com/',
+    https_endpoint: 'https://relay-' + randomHex(5) + '.example.net/',
     tor_endpoint: 'http://btc-relay-demoabcdefghijklmnop.onion/',
   },
   trusted_nodes: [
@@ -758,19 +758,27 @@ function staticApp({ id, title, version, shortDesc, longDesc, license, state, la
 }
 
 // Static dev apps (always shown in My Apps when using mock backend).
-// Only one Bitcoin implementation is pre-installed (Bitcoin Core); Bitcoin Knots
-// remains installable from the marketplace.
 const staticDevApps = {
   bitcoin: staticApp({
     id: 'bitcoin',
     title: 'Bitcoin Core',
-    version: '27.1',
+    version: '28.4.0',
     shortDesc: 'Full Bitcoin node',
     longDesc: 'Validate every transaction and block. Full consensus enforcement — the bedrock of sovereignty.',
     state: 'running',
     lanPort: 8332,
     icon: '/assets/img/app-icons/bitcoin-core.png',
   }),
+  'bitcoin-knots': staticApp({
+    id: 'bitcoin-knots',
+    title: 'Bitcoin Knots',
+    version: '28.1.0',
+    shortDesc: 'Full Bitcoin node',
+    longDesc: 'Validate and relay Bitcoin blocks and transactions with the Archipelago custom node UI.',
+    state: 'running',
+    lanPort: 8334,
+    icon: '/assets/img/app-icons/bitcoin-knots.webp',
+  }),
   lnd: staticApp({
     id: 'lnd',
     title: 'LND',
@@ -779,15 +787,17 @@ const staticDevApps = {
     longDesc: 'Instant Bitcoin payments with near-zero fees. Open channels, route payments, earn sats.',
     state: 'running',
     lanPort: 8080,
+    icon: '/assets/img/app-icons/lnd.svg',
   }),
-  electrs: staticApp({
-    id: 'electrs',
-    title: 'Electrs',
-    version: '0.10.6',
-    shortDesc: 'Electrum Server in Rust',
+  electrumx: staticApp({
+    id: 'electrumx',
+    title: 'ElectrumX',
+    version: '1.18.0',
+    shortDesc: 'Electrum server',
     longDesc: 'Private blockchain indexing for wallet lookups. Connect Sparrow, BlueWallet, or any Electrum-compatible wallet.',
     state: 'running',
-    lanPort: 50001,
+    lanPort: 50002,
+    icon: '/assets/img/app-icons/electrumx.webp',
   }),
   mempool: staticApp({
     id: 'mempool',
@@ -829,15 +839,6 @@ const staticDevApps = {
     lanPort: 8083,
     icon: '/assets/img/app-icons/file-browser.webp',
   }),
-  thunderhub: staticApp({
-    id: 'thunderhub',
-    title: 'ThunderHub',
-    version: '0.13.31',
-    shortDesc: 'Lightning node management UI',
-    longDesc: 'Full Lightning node management — channels, payments, routing fees, and node health. Connect to your LND and manage everything from one dashboard.',
-    state: 'running',
-    lanPort: 3010,
-  }),
   fedimint: staticApp({
     id: 'fedimint',
     title: 'Fedimint',
@@ -979,31 +980,38 @@ app.get('/app/bitcoin-ui/', async (_req, res) => {
 })
 
 // ── Mock app UIs served in the in-app iframe (DEMO) ─────────────────────────
-function demoAppShell(title, accent, bodyHtml) {
+function demoAppShell(title, sub, iconPath, bodyHtml) {
+  const accent = '#f7931a' // Archipelago orange
   return `<!DOCTYPE html><html lang="en"><head><meta charset="utf-8">
 <meta name="viewport" content="width=device-width,initial-scale=1"><title>${title}</title>
 <style>
   *{margin:0;padding:0;box-sizing:border-box}
-  body{background:#0b0f1a;color:#e6e8ee;font-family:system-ui,-apple-system,Segoe UI,Roboto,sans-serif;min-height:100vh;padding:28px}
+  body{background:#000;color:#f2f2f4;font-family:system-ui,-apple-system,Segoe UI,Roboto,sans-serif;min-height:100vh;padding:28px;
+       background-image:radial-gradient(1200px 500px at 50% -10%, rgba(247,147,26,.07), transparent 70%);}
   .wrap{max-width:860px;margin:0 auto}
   .hd{display:flex;align-items:center;gap:14px;margin-bottom:22px}
-  .dot{width:11px;height:11px;border-radius:50%;background:${accent};box-shadow:0 0 12px ${accent}}
+  .ico{width:46px;height:46px;border-radius:12px;object-fit:cover;background:rgba(255,255,255,.04);border:1px solid rgba(255,255,255,.08);flex-shrink:0}
   h1{font-size:22px;font-weight:650}
-  .sub{color:#8b93a7;font-size:13px;margin-top:2px}
+  .sub{color:#8a8f9a;font-size:13px;margin-top:2px}
   .grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:14px;margin-bottom:18px}
-  .card{background:rgba(255,255,255,.04);border:1px solid rgba(255,255,255,.08);border-radius:14px;padding:16px}
-  .k{color:#8b93a7;font-size:12px;text-transform:uppercase;letter-spacing:.5px}
+  .card{background:rgba(255,255,255,.035);border:1px solid rgba(255,255,255,.08);border-radius:14px;padding:16px}
+  .k{color:#8a8f9a;font-size:12px;text-transform:uppercase;letter-spacing:.5px}
   .v{font-size:20px;font-weight:650;margin-top:6px}
   .v.mono{font-family:ui-monospace,Menlo,monospace;font-size:13px;word-break:break-all;font-weight:500}
-  .bar{height:8px;border-radius:6px;background:rgba(255,255,255,.08);overflow:hidden;margin-top:10px}
+  .bar{height:8px;border-radius:6px;background:rgba(255,255,255,.07);overflow:hidden;margin-top:10px}
   .bar>i{display:block;height:100%;background:${accent}}
-  .badge{display:inline-flex;align-items:center;gap:6px;background:rgba(34,197,94,.15);color:#86efac;border:1px solid rgba(34,197,94,.3);padding:4px 10px;border-radius:999px;font-size:12px}
+  .badge{display:inline-flex;align-items:center;gap:6px;background:rgba(34,197,94,.14);color:#86efac;border:1px solid rgba(34,197,94,.3);padding:4px 10px;border-radius:999px;font-size:12px}
   table{width:100%;border-collapse:collapse;font-size:13px}
   td,th{text-align:left;padding:9px 6px;border-bottom:1px solid rgba(255,255,255,.06)}
-  th{color:#8b93a7;font-weight:500;font-size:11px;text-transform:uppercase}
-  .demo-tag{position:fixed;bottom:14px;right:16px;font-size:11px;color:#6b7280}
-</style></head><body><div class="wrap">${bodyHtml}</div>
-<div class="demo-tag">Archipelago demo · signet</div></body></html>`
+  th{color:#8a8f9a;font-weight:500;font-size:11px;text-transform:uppercase}
+  .demo-tag{position:fixed;bottom:14px;right:16px;font-size:11px;color:#5b6070}
+</style></head><body><div class="wrap">
+  <div class="hd">
+    <img class="ico" src="${iconPath}" onerror="this.style.visibility='hidden'" alt="">
+    <div><h1>${title}</h1><div class="sub">${sub}</div></div>
+  </div>
+  ${bodyHtml}
+</div><div class="demo-tag">Archipelago demo · signet</div></body></html>`
 }
 
 // 12 trusted/federated nodes for the demo Federation view.
@@ -1047,29 +1055,40 @@ function demoFederationNodes() {
   })
 }
 
-app.get(['/app/electrumx/', '/app/electrs/', '/app/archy-electrs-ui/'], (_req, res) => {
-  res.type('html').send(demoAppShell('Electrs — Electrum Server', '#22d3ee', `
-    <div class="hd"><span class="dot"></span><div><h1>Electrs</h1><div class="sub">Electrum server in Rust · signet</div></div></div>
-    <div class="grid">
-      <div class="card"><div class="k">Status</div><div class="v"><span class="badge">● Serving clients</span></div></div>
-      <div class="card"><div class="k">Indexed height</div><div class="v">902,418</div><div class="bar"><i style="width:100%"></i></div></div>
-      <div class="card"><div class="k">RPC port</div><div class="v mono">50002 (SSL)</div></div>
-      <div class="card"><div class="k">Connected wallets</div><div class="v">3</div></div>
-      <div class="card"><div class="k">Mempool txs</div><div class="v">12,840</div></div>
-      <div class="card"><div class="k">DB size</div><div class="v">58.2 GB</div></div>
-    </div>
-    <div class="card"><div class="k" style="margin-bottom:8px">Recent client subscriptions</div>
-      <table><thead><tr><th>Wallet</th><th>Address type</th><th>Subscribed</th></tr></thead><tbody>
-        <tr><td>Sparrow</td><td>P2WPKH</td><td>2 min ago</td></tr>
-        <tr><td>BlueWallet</td><td>P2TR</td><td>9 min ago</td></tr>
-        <tr><td>Electrum</td><td>P2WPKH</td><td>21 min ago</td></tr>
-      </tbody></table>
-    </div>`))
+// ElectrumX: serve the real electrs-ui shell (its qrcode.js sibling + the
+// /electrs-status endpoint it polls are served below with dummy data).
+app.get(['/app/electrumx/', '/app/electrs/', '/app/archy-electrs-ui/'], async (_req, res) => {
+  try {
+    const html = await fs.readFile(path.join(__dirname, '..', 'docker', 'electrs-ui', 'index.html'), 'utf8')
+    res.type('html').send(html)
+  } catch (error) {
+    res.status(500).type('text/plain').send(`Unable to load ElectrumX UI mock: ${error.message}`)
+  }
+})
+app.get(['/app/electrumx/qrcode.js', '/app/electrs/qrcode.js', '/app/archy-electrs-ui/qrcode.js'], async (_req, res) => {
+  try {
+    const js = await fs.readFile(path.join(__dirname, '..', 'docker', 'electrs-ui', 'qrcode.js'), 'utf8')
+    res.type('application/javascript').send(js)
+  } catch { res.status(404).end() }
+})
+// Dummy status for both the electrs-ui shell and the in-app ElectrumX sync screen.
+app.get('/electrs-status', (_req, res) => {
+  res.json({
+    status: 'ready',
+    synced: true,
+    stale: false,
+    error: null,
+    bitcoin_height: 902418,
+    network_height: 902418,
+    indexed_height: 902418,
+    progress_pct: 100,
+    index_size: '58.2 GB',
+    tor_onion: 'electrumx' + randomHex(20) + '.onion',
+  })
 })
 
 app.get(['/app/lnd/', '/app/lnd-ui/', '/app/archy-lnd-ui/', '/app/thunderhub/'], (_req, res) => {
-  res.type('html').send(demoAppShell('LND — Lightning', '#f7931a', `
-    <div class="hd"><span class="dot"></span><div><h1>LND</h1><div class="sub">Lightning Network Daemon · signet</div></div></div>
+  res.type('html').send(demoAppShell('LND', 'Lightning Network Daemon · signet', '/assets/img/app-icons/lnd.svg', `
     <div class="grid">
       <div class="card"><div class="k">Node</div><div class="v"><span class="badge">● Synced to chain</span></div></div>
       <div class="card"><div class="k">Channel balance</div><div class="v">8,250,000 sat</div></div>
@@ -1088,9 +1107,27 @@ app.get(['/app/lnd/', '/app/lnd-ui/', '/app/archy-lnd-ui/', '/app/thunderhub/'],
     </div>`))
 })
 
+app.get(['/app/bitcoin-core/'], (_req, res) => {
+  res.type('html').send(demoAppShell('Bitcoin Core', 'Full node · signet', '/assets/img/app-icons/bitcoin-core.png', `
+    <div class="grid">
+      <div class="card"><div class="k">Status</div><div class="v"><span class="badge">● Synced</span></div></div>
+      <div class="card"><div class="k">Block height</div><div class="v">902,418</div><div class="bar"><i style="width:100%"></i></div></div>
+      <div class="card"><div class="k">Chain</div><div class="v">signet</div></div>
+      <div class="card"><div class="k">Connections</div><div class="v">18</div></div>
+      <div class="card"><div class="k">Mempool</div><div class="v">12,840 txs</div></div>
+      <div class="card"><div class="k">Version</div><div class="v mono">v28.4.0</div></div>
+    </div>
+    <div class="card"><div class="k" style="margin-bottom:8px">Peers</div>
+      <table><thead><tr><th>Address</th><th>Type</th><th>Height</th></tr></thead><tbody>
+        <tr><td>node1.signet…onion</td><td>outbound</td><td>902,418</td></tr>
+        <tr><td>node2.signet…onion</td><td>outbound</td><td>902,418</td></tr>
+        <tr><td>192.168.1.42</td><td>inbound</td><td>902,417</td></tr>
+      </tbody></table>
+    </div>`))
+})
+
 app.get(['/app/fedimint/', '/app/fedimintd/'], (_req, res) => {
-  res.type('html').send(demoAppShell('Fedimint — Guardian', '#a78bfa', `
-    <div class="hd"><span class="dot"></span><div><h1>Fedimint Guardian</h1><div class="sub">Archipelago Federation · 4-of-5 consensus</div></div></div>
+  res.type('html').send(demoAppShell('Fedimint Guardian', 'Archipelago Federation · 4-of-5 consensus', '/assets/img/app-icons/fedimint.png', `
     <div class="grid">
       <div class="card"><div class="k">Consensus</div><div class="v"><span class="badge">● Online</span></div></div>
       <div class="card"><div class="k">Epoch</div><div class="v">48,217</div></div>
@@ -4065,12 +4102,13 @@ app.get(['/app/:id', '/app/:id/'], (req, res) => {
   res.type('html').send(`<!DOCTYPE html><html lang="en"><head><meta charset="utf-8">
 <meta name="viewport" content="width=device-width,initial-scale=1"><title>${title}</title>
 <style>*{margin:0;padding:0;box-sizing:border-box}html,body{height:100%}
-body{background:#0b0f1a;color:#e6e8ee;font-family:system-ui,-apple-system,Segoe UI,Roboto,sans-serif;display:flex;align-items:center;justify-content:center}
+body{background:#000;color:#f2f2f4;font-family:system-ui,-apple-system,Segoe UI,Roboto,sans-serif;display:flex;align-items:center;justify-content:center;
+     background-image:radial-gradient(900px 400px at 50% -10%, rgba(247,147,26,.07), transparent 70%)}
 .card{text-align:center;padding:48px 40px;max-width:380px}
-img{width:84px;height:84px;border-radius:20px;object-fit:cover;margin-bottom:20px;background:rgba(255,255,255,.05)}
+img{width:84px;height:84px;border-radius:20px;object-fit:cover;margin-bottom:20px;background:rgba(255,255,255,.04);border:1px solid rgba(255,255,255,.08)}
 h1{font-size:22px;font-weight:650;margin-bottom:8px}
-p{color:#8b93a7;font-size:14px;line-height:1.5}
-.tag{margin-top:18px;display:inline-block;font-size:12px;color:#fbbf24;border:1px solid rgba(251,191,36,.3);background:rgba(251,191,36,.1);padding:5px 12px;border-radius:999px}
+p{color:#8a8f9a;font-size:14px;line-height:1.5}
+.tag{margin-top:18px;display:inline-block;font-size:12px;color:#f7931a;border:1px solid rgba(247,147,26,.3);background:rgba(247,147,26,.1);padding:5px 12px;border-radius:999px}
 </style></head><body><div class="card">
 <img src="/assets/img/app-icons/${id}.png" onerror="this.onerror=null;this.src='/assets/icon/favico-black.svg'" alt="">
 <h1>${title}</h1>

neode-ui/src/composables/useDemoIntro.ts

@@ -62,8 +62,8 @@ const DEMO_EXTERNAL_URLS: Record<string, string> = {
 // Apps with a same-origin mock UI served by the demo backend.
 const DEMO_MOCK_UI: Record<string, string> = {
   'bitcoin-knots': '/app/bitcoin-ui/',
-  'bitcoin-core': '/app/bitcoin-ui/',
-  bitcoin: '/app/bitcoin-ui/',
+  'bitcoin-core': '/app/bitcoin-core/',
+  bitcoin: '/app/bitcoin-core/',
   'bitcoin-ui': '/app/bitcoin-ui/',
   electrs: '/app/electrumx/',
   electrumx: '/app/electrumx/',

neode-ui/src/views/discover/AppGrid.vue

@@ -102,9 +102,9 @@
             @click.stop="$emit('launch', app)"
             class="px-4 py-2 glass-button glass-button-sm rounded-lg text-sm font-medium"
           >Launch</button>
-          <!-- Scanning -->
+          <!-- Scanning (skipped in demo — there are no real containers to scan) -->
           <span
-            v-else-if="!containersScanned && (app.source === 'local' || app.dockerImage)"
+            v-else-if="!IS_DEMO && !containersScanned && (app.source === 'local' || app.dockerImage)"
             class="flex-1 px-4 py-2 rounded-lg text-white/50 text-sm font-medium text-center cursor-default relative overflow-hidden"
           >
             <span class="discover-shimmer-bg"></span>

neode-ui/src/views/discover/FeaturedApps.vue

@@ -64,7 +64,7 @@
             Starting...
           </span>
           <button
-            v-else-if="!containersScanned && app.dockerImage"
+            v-else-if="!IS_DEMO && !containersScanned && app.dockerImage"
             disabled
             class="text-white/40 text-sm flex items-center gap-2"
           >

neode-ui/vite.config.ts

@@ -156,6 +156,8 @@ export default defineConfig({
       '/app/electrs': { target: process.env.BACKEND_URL || 'http://localhost:5959', changeOrigin: true, secure: false },
       '/app/lnd': { target: process.env.BACKEND_URL || 'http://localhost:5959', changeOrigin: true, secure: false },
       '/app/fedimint': { target: process.env.BACKEND_URL || 'http://localhost:5959', changeOrigin: true, secure: false },
+      '/app/bitcoin-core': { target: process.env.BACKEND_URL || 'http://localhost:5959', changeOrigin: true, secure: false },
+      '/electrs-status': { target: process.env.BACKEND_URL || 'http://localhost:5959', changeOrigin: true, secure: false },
       // Serve the node's deployed AIUI same-origin like production (set VITE_AIUI_URL=/aiui/)
       '/aiui': {
         target: process.env.AIUI_PROXY_TARGET || 'http://127.0.0.1:80',