fix(spa): follow the device to another network

Moving between mobile data and the node's Wi-Fi left the connection on
the network it had left until ICE gave up, and a group that had failed
was never tried again: the Android application had to be killed. A
change of network or an ICE disconnection now pings the session and
reconnects one that does not answer, wakes a reconnect backing off, and
retries a group page left on an error.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

1 files changed, 12 insertions, 0 deletions

diff --git a/packages/meshbay-hub/src/meshbay_hub/static/group-page.js b/packages/meshbay-hub/src/meshbay_hub/static/group-page.js
index 5972e000..728ffc37 100644
--- a/packages/meshbay-hub/src/meshbay_hub/static/group-page.js
+++ b/packages/meshbay-hub/src/meshbay_hub/static/group-page.js
@@ -789,6 +789,18 @@ function GroupPage({ groupId, group, token, username, userId, userPrefs,
     // it; nothing in between should disturb a working connection.
   }, [groupId, Boolean(token), retryKey]);
 
+  // A group that could not be reached is tried again when the device joins
+  // another network: from the Wi-Fi to mobile data, or back, is what decides
+  // whether the node can be reached, and in the Android application there is
+  // no reload to do it. Not while a code, a passphrase or a device link is
+  // asked for: those wait for the person, not for a network.
+  useEffect(() => {
+    if (status !== 'error' || needsPass || needsCode || needsDevice) return undefined;
+    const T = window.MeshBayTransport;
+    if (!T || !T.onNetworkChange) return undefined;
+    return T.onNetworkChange(() => setRetryKey((k) => k + 1));
+  }, [status, needsPass, needsCode, needsDevice]);
+
   const downloadFileForModal = useCallback(async (entry) => {
     // The video/preview modals' own download button — the table's row and
     // toolbar actions call the same shared helper from files-app.js, since