UI: centered nav title, settings tabs, running status, manual buttons.

Co-authored-by: Cursor <cursoragent@cursor.com>

frontend/src/styles/app.css

@@ -49,7 +49,8 @@ input {
 }
 
 .topnav {
-  display: flex;
+  display: grid;
+  grid-template-columns: 1fr auto 1fr;
   align-items: center;
   gap: 8px;
   padding: 10px 16px;
@@ -61,11 +62,31 @@ input {
   z-index: 10;
 }
 
+.topnav-side {
+  display: flex;
+  align-items: center;
+  gap: 8px;
+  min-width: 0;
+}
+
+.topnav-side.right {
+  justify-content: flex-end;
+}
+
+.topnav-center {
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  gap: 4px;
+}
+
 .brand {
   font-weight: 700;
   letter-spacing: 0.02em;
-  margin-right: 12px;
   color: var(--accent);
+  white-space: nowrap;
+  overflow: hidden;
+  text-overflow: ellipsis;
 }
 
 .topnav a {
@@ -73,6 +94,7 @@ input {
   text-decoration: none;
   padding: 8px 12px;
   border-radius: 6px;
+  white-space: nowrap;
 }
 
 .topnav a.active {
@@ -80,6 +102,38 @@ input {
   background: var(--bg-panel);
 }
 
+.tabs {
+  display: flex;
+  gap: 4px;
+  margin-bottom: 12px;
+  border-bottom: 1px solid var(--line);
+  padding-bottom: 0;
+}
+
+.tab {
+  background: transparent;
+  border: 0;
+  color: var(--muted);
+  padding: 10px 14px;
+  cursor: pointer;
+  border-bottom: 2px solid transparent;
+  margin-bottom: -1px;
+}
+
+.tab.active {
+  color: var(--text);
+  border-bottom-color: var(--accent);
+}
+
+.status-running {
+  color: var(--up);
+  font-weight: 600;
+}
+
+.status-stopped {
+  color: var(--muted);
+}
+
 .topnav .spacer {
   flex: 1;
 }