Don't capitalise the first letter of a list item

This "feature" of capitalising the first letter came from the
kaios-native-ui project, but in this case it's more like a bug
than a feature because case is important in things like usernames
and JIDs (as well as conversation titles, since people deserve the
right to be fancy).

src/components/ListItem.svelte

@@ -42,4 +42,10 @@
   white-space: normal;
   overflow: auto;
 }
+
+/* Override the first-letter capitalisation of kaios-native-ui */
+.list-item-indicator__text::first-letter,
+.list-item-indicator__subtext::first-letter {
+  text-transform: none;
+}
 </style>