fix(oracle-l6): close 2 actionable caveats

1. Approvals tenantId hydration race
   loadQueue used to fall back to 'show all rows' when tenantId was
   null. Now early-returns []  until tenantId hydrates, and the effect
   depends on tenantId so it reloads once auth completes.

2. Settings persona quick-switch threw 'Password required'
   signIn() in Settings called loginAs(email) without options.method.
   Now explicit { method: 'dev' } so the documented dev-login path
   is used.

src/scenes/Settings.tsx

@@ -32,7 +32,7 @@ export default function Settings() {
   const signIn = async (email: string) => {
     setSigningIn(true);
     try {
-      await loginAs(email);
+      await loginAs(email, undefined, { method: "dev" });
     } finally {
       setSigningIn(false);
     }