fix(client): say when the account's node is elsewhere, and let go of it

Signing in on a desktop links this machine's node to the account, but never
over a key already linked (that would cut off the user's other machine) nor a
node set up for another account. On a real install both left the node reading
"Running" while the hub refused it in a loop, and nothing said why. And the
only way to unlink was the linked machine's own Node page, of no use once
that machine is gone.

- The Node page works out, from the node and the hub each time it looks,
  whether this node can serve the signed-in account (nodeLinkProblem), and
  says why not: "Link this node instead" (asked first) puts this node's key
  on the account; "Use this node for my account" switches a node set up for
  another account through node:start, which takeOver now lets past a node
  that answers "running". The first version went through node:start for
  both, and clicking it on a real install did nothing: a node signed in
  before the account was linked elsewhere answers "running".
- The Profile page unlinks the account's node (DELETE /v1/users/me/node_key),
  from any machine.

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

1 files changed, 4 insertions, 1 deletions

diff --git a/packages/meshbay-client/src/main.js b/packages/meshbay-client/src/main.js
index 603dedc..1af4386 100644
--- a/packages/meshbay-client/src/main.js
+++ b/packages/meshbay-client/src/main.js
@@ -2168,8 +2168,11 @@ Its log: ${nodeLogHint()}`);
     // other had just started.
     if (nodeWithAppStart) await nodeWithAppStart.catch(() => {});
     if (nodeEnsuring) await nodeEnsuring.catch(() => {});
+    // `takeOver`: the Node page's "use this node for my account", for a node
+    // set up for another account -- which is running, as that account, and
+    // must be switched and restarted all the same.
     const already = await probeNode();
-    if (already && already.status === 'running') {
+    if (already && already.status === 'running' && !(opts && opts.takeOver)) {
       return { started: true, ...already };
     }