UI fixes: identical headers, panel styling, view toggle icons, sync map view

- Show mode toggle on all pages (not just catalog)
- Panel background base-300, top-20 spacing from navbar
- View toggle with colored icons in circles
- Sync mapViewMode when selecting (supplier chip -> suppliers view)

app/layouts/topnav.vue

@@ -21,7 +21,7 @@
         :hub-label="hubLabel"
         :quantity="quantity"
         :can-search="canSearch"
-        :show-mode-toggle="isCatalogSection"
+        :show-mode-toggle="true"
         @toggle-theme="toggleTheme"
         @set-catalog-mode="setCatalogMode"
         @sign-out="onClickSignOut"