Vest: the relayed login binds itself to an unset Vest firm

A Vest firm's credential is the wallet of the login it trades. It no longer
has to be typed or clicked in: when the extension relays a Vest tab's
session and a Vest firm here has no credential, that wallet is saved as the
credential (lib/vest-wallet.ts), the client starts, and the backup is
pushed.

- A saved wallet is never replaced. When the tab is signed in to another
  login, the firm now says which one and how to switch: sign in as the
  saved wallet, or remove the credential.
- With two logins relayed at once nothing binds itself; the one-click form
  decides.
- Extension 0.17.1 re-posts the session every minute even when it hasn't
  changed. The dashboard holds it in memory only, so a restart there was
  unauthenticated until the tab's next renewal (up to ~15 min); now it is
  back within a minute, and a firm created later binds within a minute too.

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

lib/vest-wallet.ts

@@ -0,0 +1,42 @@
+/**
+ * Binds the Vest login the extension relays to this machine's Vest firm, so
+ * nobody has to copy a wallet address into the dashboard.
+ *
+ * A Vest firm's only credential here is the wallet of the login whose session
+ * it trades (lib/vest-session.ts). One person per machine, and Vest allows one
+ * profile per person, so the Vest tab signed in on this machine is the one to
+ * trade. It is bound automatically when:
+ *   - the firm has no credential yet. A saved one is never replaced: someone
+ *     chose it, and a different login in the tab is a mistake to flag (the
+ *     client says so), not one to follow;
+ *   - exactly one wallet has a live relayed session. Two logins in two tabs
+ *     can't be told apart, so the dashboard's one-click form decides.
+ */
+
+import { getCachedCatalog } from './firm-catalog';
+import { getCredentials, setCredentials } from './db';
+import { listVestSessions } from './vest-session';
+import { reconcileClients } from './clients';
+import { scheduleBackupPush } from './backup-sync';
+
+/** Bind the relayed wallet to every Vest firm here that has no credential.
+ *  Returns the names of the firms it bound. */
+export function autoBindVestWallet(now = Date.now()): string[] {
+    const live = [...new Set(listVestSessions().filter((s) => s.expiresAt > now).map((s) => s.primaryAddr))];
+    if (live.length !== 1) return [];
+    const wallet = live[0];
+    const bound: string[] = [];
+    for (const firm of getCachedCatalog()) {
+        if (firm.platform !== 'vest') continue;
+        const creds = getCredentials(firm.id);
+        if (creds && (creds.apiKey || creds.username || creds.password)) continue;
+        setCredentials(firm.id, firm.name, '', '', wallet);
+        bound.push(firm.name);
+        console.log(`[vest] ${firm.name}: bound to wallet ${wallet}, the Vest login signed in on this machine`);
+    }
+    if (bound.length > 0) {
+        reconcileClients();
+        scheduleBackupPush();
+    }
+    return bound;
+}