fix(ui): use a grid icon for Customize Dashboard

The settings icon is a circle with radiating spokes, which reads as a
sun/light-mode toggle rather than a dashboard control. Swap it for the
grid icon, the standard dashboard-layout affordance.

templates/library_switcher_templ.go

@@ -190,7 +190,7 @@ func DashboardActions() templ.Component {
 		if templ_7745c5c3_Err != nil {
 			return templ_7745c5c3_Err
 		}
-		templ_7745c5c3_Err = Icon("settings", "h-5 w-5").Render(ctx, templ_7745c5c3_Buffer)
+		templ_7745c5c3_Err = Icon("grid", "h-5 w-5").Render(ctx, templ_7745c5c3_Buffer)
 		if templ_7745c5c3_Err != nil {
 			return templ_7745c5c3_Err
 		}