fix: RC feedback round 2 — kiosk staleness, LND icon+retry, mesh detection surfacing

Kiosk (backgrounds + FIPS mismatch, one root cause each):
- kiosk service now also waits for the web-ui asset swap (probes a large
  bg asset, bounded 60s) — it launched mid-rsync and CSS background 404s
  are never refetched, hence blank backgrounds on first boot
- FipsNetworkCard polls every 15s instead of fetching once on mount
- PWA updates auto-apply on the kiosk (localStorage kiosk flag) — an
  unattended kiosk could never click 'Update Now' and ran stale bundles

LND App Store:
- catalog icon pointed at lnd.svg which doesn't exist (lnd.png does);
  store card also retries the sibling extension before the placeholder
- image pulls retry once after fast transient failures (<30s) — fresh
  first-boot networks reset connections; slow failures aren't retried
  so the UI never waits longer than before

Mesh detection:
- mesh.status now always reports device_present + detected_devices
  (previously only when the service wasn't running, so the UI couldn't
  tell 'no radio' from 'radio present, session connecting')
- Mesh page shows 'Mesh device detected' badge + 'Device detected —
  connecting' status for present-but-not-connected radios
- the 99-mesh-radio.rules udev rule was never staged into the ISO tree
  (installer searched for it and found nothing) — ship it at the media
  root and install it from install-to-disk.sh too

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

core/archipelago/src/api/rpc/mesh/status.rs

@@ -37,6 +37,21 @@ impl RpcHandler {
                 "receive_block_headers".into(),
                 config.receive_block_headers.into(),
             );
+            // Raw serial-device presence, in BOTH branches. MeshStatus has no
+            // such field, so while the service was running the UI couldn't
+            // tell "no radio plugged in" from "radio present but the session
+            // can't open it yet" — both looked like device_connected=false.
+            if !obj.contains_key("detected_devices") {
+                let devices = mesh::detect_devices().await;
+                obj.insert("device_present".into(), (!devices.is_empty()).into());
+                obj.insert("detected_devices".into(), devices.into());
+            } else {
+                let present = obj
+                    .get("detected_devices")
+                    .and_then(|v| v.as_array())
+                    .is_some_and(|a| !a.is_empty());
+                obj.insert("device_present".into(), present.into());
+            }
         }
         Ok(value)
     }