phase-10.5: market screener ui enhancements

ui/src/styles/_layout.scss

@@ -23,7 +23,6 @@ nav {
 .links {
   display: flex;
   gap: var(--space-xs);
-  margin-left: auto;
 
   a {
     color: var(--text-dim);
@@ -42,6 +41,29 @@ nav {
   }
 }
 
+// ── Nav auth (sign in / user + sign out) ─────────────────────────────────
+
+.nav-auth {
+  display: flex;
+  align-items: center;
+  gap: var(--space-sm);
+  margin-left: auto;
+}
+
+.nav-user {
+  font-size: var(--fs-sm);
+  color: var(--text-dim);
+  max-width: 180px;
+  overflow: hidden;
+  text-overflow: ellipsis;
+  white-space: nowrap;
+}
+
+.btn-sm {
+  padding: 4px 10px;
+  font-size: var(--fs-sm);
+}
+
 main { flex: 1; padding: 28px 32px; }
 
 // ── Navigation progress bar ───────────────────────────────────────────────