Dashboard Studio 1.6.0: app icon, clock weather, icon-only tab rail

- App store icon (icon.png) and favicon, drawn by tools/make_icon.py
- Clock can show a weather entity with today's high and low from
  weather.get_forecasts
- Side menu gets an icon-only rail style (now the default): full height,
  centered icons, active marker, names as hover/focus tooltips; phones
  keep a labelled bottom tab bar

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

dashboard_studio/config.yaml

@@ -1,5 +1,5 @@
 name: Dashboard Studio
-version: "1.5.0"
+version: "1.6.0"
 slug: dashboard_studio
 description: Drag-and-drop dashboard builder with a free-form grid, live entity widgets and themes.
 url: https://git.melvanveen.nl/veenm/ha-dashboard-studio