[ThemePicker 7/N] Initial setup of ThemeFragment UI

Add a view for the theme preview card for font, and hook up
the option tiles as well.

Bug: 120559294

Change-Id: I7efa779e9db730f8aaff151eac65bee42ed5db6b
diff --git a/res/menu/bottom_navigation_menu.xml b/res/menu/bottom_navigation_menu.xml
index 4954206..a856222 100644
--- a/res/menu/bottom_navigation_menu.xml
+++ b/res/menu/bottom_navigation_menu.xml
@@ -23,7 +23,7 @@
     <item
         android:id="@+id/nav_clock"
         android:title="@string/clock_title"
-        android:icon="@drawable/ic_nav_theme" />
+        android:icon="@drawable/ic_nav_grid" />
     <item
         android:id="@+id/nav_grid"
         android:title="@string/grid_title"
@@ -31,5 +31,5 @@
     <item
         android:id="@+id/nav_wallpaper"
         android:title="@string/wallpaper_title"
-        android:icon="@drawable/ic_nav_theme" />
+        android:icon="@drawable/ic_nav_wallpaper" />
 </menu>
\ No newline at end of file