Matrix card: clear invite-confirmation UX when saving an external MXID

app/main.py

@@ -413,6 +413,7 @@ PAGE_HTML = """<!DOCTYPE html>
   }
   .new-key input:focus { outline: none; border-color: var(--green-mid); }
   .hint { color: var(--muted); font-size: 12px; margin-top: 10px; }
+  .hint.ok { color: #2f5c30; }
   .key-reveal {
     margin-top: 16px; padding: 16px;
     background: #eaf3ea; border: 1px solid var(--green-mid); border-radius: 10px;
@@ -664,7 +665,11 @@ async function saveMxid() {
     const d = await r.json();
     if (d.error) { $('mxid-status').textContent = d.error; }
     else if (mxid) {
-      $('mxid-status').textContent = 'Saved — invitations will go to ' + mxid + '.';
+      const joined = d.invite_sent === false;
+      $('mxid-status').innerHTML = 'Saved. An invite to the co-op Matrix space is on its way to <strong>' + escapeHtml(mxid) + '</strong>' +
+        (joined ? ' — that account could not be reached right now; the nightly sync will retry automatically.' :
+        ' — accept it from that account to join. Your co-op account will no longer receive invites.');
+      $('mxid-status').className = 'hint ok';
     } else {
       $('mxid-status').textContent = 'Cleared — your co-op account will be used for Matrix.';
       $('mxid-input').value = '';