style(frontend): apply ultracite 7.12 formatting and lint rules

frontend/src/lib/components/presence/PresenceHeatmap.svelte

@@ -50,9 +50,9 @@
         {#each row as cell, hour (hour)}
           <span
             class="cell"
-            class:empty={cell.total === 0}
-            style:--i={intensity(cell)}
             title={cellTitle(day, hour, cell)}
+            style:--i={intensity(cell)}
+            class:empty={cell.total === 0}
           ></span>
         {/each}
       </div>