Add clock, forecast, graph, sun, timer and person cards with wide tiles

Any tile can now be double width: pack() in runtime_model.h places wide
tiles in the left column and the manager preview follows the same rules.
New cards: built-in clock (digital or analog, screen.clock), five-day
weather forecast on a wide weather card fed by weather.get_forecasts,
history sparkline for sensors, sunrise/sunset (sun.sun), live kitchen
timer (timer.*, tap starts or pauses) and presence (person.*). The
manager pre-computes time-zone and forecast extras in a new 'x' object
and refuses layouts with new domains until the screen runs 0.2.14.

The self-test follows the packing, checks custom card parts and wide
widths, and diagnostics/send_layout.py pushes a demo layout of every
card type for render checks without Home Assistant. App 0.2.12,
firmware 0.2.14.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

screen_manager/app/static/index.html

@@ -74,8 +74,9 @@
                 <span id="count">0 / 10</span>
               </div>
               <p class="hint">
-                Klik op een tegel om bediening en weergave te kiezen. Sleep om
-                te ordenen. Zes tegels per pagina.
+                Klik op een tegel om bediening, weergave en breedte te kiezen.
+                Sleep om te ordenen. Zes vakjes per pagina; een dubbelbrede
+                tegel telt voor twee en begint altijd links.
               </p>
               <div id="layout-preview" aria-label="Schermindeling"></div>
               <ol id="tiles"></ol>