many styling changes to applets and palettes applet esp.; all applets seeded w. < 3rows bumped to 3 w. new migration in apps.applets; setting palette no longer reloads entire page, only preset background-color vars; two new ITs in apps.dash.tests.ITs.test_views.SetPaletteTest to ensure dash.views functionality fires; unified h2 applet title html structure & styled its text vertically to waste less applet space

src/templates/apps/dashboard/_partials/_applet-my-notes.html

@@ -2,7 +2,7 @@
     id="id_applet_my_notes"
     style="--applet-cols: {{ entry.applet.grid_cols }}; --applet-rows: {{ entry.applet.grid_rows }};"
 >
-    <h2><a href="{% url 'my_notes' user.id %}" class="my-notes-main">My notes</a></h2>
+    <h2><a href="{% url 'my_notes' user.id %}" class="my-notes-main">My Notes</a></h2>
     <div class="my-notes-container">
         <ul>
             {% for note in recent_notes %}