feat: initial KosmoConnect platform v0.1

Includes:
- Backend services: ingestion (:8001), weather API (:8002),
  gateway (:8003), billing (:8004) with BTCPay integration
- Shared asyncpg pool, TimescaleDB hypertable, Redis, Mosquitto MQTT
- React frontend: Dashboard (MapLibre) and Messaging (chat UI)
- Bridge daemon for Pi + Meshtastic (Serial/TCP T-Deck support)
- Production Docker Compose, Nginx reverse proxy, ops scripts
- DEPLOY.md with step-by-step deployment guide

web/dashboard/src/components/NodePopup.jsx

@@ -0,0 +1,47 @@
+import { useLatest } from '../hooks/useApi'
+
+function fmt(v, unit) {
+  if (v == null) return '—'
+  return `${Number(v).toFixed(1)} ${unit}`
+}
+
+function timeAgo(iso) {
+  if (!iso) return '—'
+  const diff = Date.now() - new Date(iso).getTime()
+  const sec = Math.floor(diff / 1000)
+  if (sec < 60) return `${sec}s ago`
+  const min = Math.floor(sec / 60)
+  if (min < 60) return `${min}m ago`
+  const hr = Math.floor(min / 60)
+  return `${hr}h ago`
+}
+
+export default function NodePopup({ node }) {
+  const { reading } = useLatest(node.mesh_node_id)
+
+  return (
+    <div style={{ minWidth: '220px' }}>
+      <div style={{ fontWeight: 600, fontSize: '1rem', marginBottom: '0.25rem', color: '#38bdf8' }}>
+        {node.name || node.mesh_node_id}
+      </div>
+      <div style={{ fontSize: '0.75rem', color: '#94a3b8', marginBottom: '0.5rem' }}>
+        {node.mesh_node_id} · {timeAgo(node.last_seen)}
+      </div>
+
+      {reading ? (
+        <div style={{ display: 'grid', gridTemplateColumns: '1fr 1fr', gap: '0.35rem 0.75rem', fontSize: '0.875rem' }}>
+          <div><span style={{ color: '#94a3b8' }}>Temp</span><br/><strong>{fmt(reading.temperature_c, '°C')}</strong></div>
+          <div><span style={{ color: '#94a3b8' }}>Humidity</span><br/><strong>{fmt(reading.humidity_percent, '%')}</strong></div>
+          <div><span style={{ color: '#94a3b8' }}>Pressure</span><br/><strong>{fmt(reading.pressure_pa / 100, 'hPa')}</strong></div>
+          <div><span style={{ color: '#94a3b8' }}>Wind</span><br/><strong>{fmt(reading.wind_speed_ms, 'm/s')} {reading.wind_direction != null ? `@ ${reading.wind_direction}°` : ''}</strong></div>
+          <div><span style={{ color: '#94a3b8' }}>PM2.5</span><br/><strong>{fmt(reading.pm25_ugm3, 'µg/m³')}</strong></div>
+          <div><span style={{ color: '#94a3b8' }}>PM10</span><br/><strong>{fmt(reading.pm10_ugm3, 'µg/m³')}</strong></div>
+          <div><span style={{ color: '#94a3b8' }}>Battery</span><br/><strong>{fmt(reading.battery_voltage, 'V')}</strong></div>
+          <div><span style={{ color: '#94a3b8' }}>Solar</span><br/><strong>{fmt(reading.solar_voltage, 'V')}</strong></div>
+        </div>
+      ) : (
+        <div style={{ fontSize: '0.875rem', color: '#94a3b8' }}>No recent readings available.</div>
+      )}
+    </div>
+  )
+}