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/search/search.module.css

@@ -1,12 +1,22 @@
 div.searchLayout {
     display: grid;
-    grid-template-columns: auto 1fr;
+    grid-template-columns: 1fr;
     gap: 1rem;
     height: 100vh;
 }
 
+div.sidePanel {
+    position: fixed;
+    height: 100%;
+}
+
 @media screen and (max-width: 768px) {
     div.searchLayout {
         gap: 0;
     }
+
+    div.sidePanel {
+        position: relative;
+        height: 100%;
+    }
 }