Update nav menu styling to include everything in one header

- Move the nav menu into the chat history side panel component, so that they both show up on one line
- Update all pages to use it with the new formatting
- in mobile, present the sidebar button, home button, and profile button evenly centered in the middle

src/interface/web/app/agents/agents.module.css

@@ -46,7 +46,7 @@ div.agentList {
 }
 
 
-@media only screen and (max-width: 700px) {
+@media only screen and (max-width: 768px) {
     div.agentList {
         width: 100%;
         padding: 0;
@@ -54,4 +54,9 @@ div.agentList {
         margin-left: auto;
         grid-template-columns: 1fr;
     }
+
+    div.sidePanel {
+        position: relative;
+        height: 100%;
+    }
 }