Default UI redesign (#7429)

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* Update default.sidebar.vue

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* Update sticky-sidebar.ts

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* Update messaging-room.form.vue

* Update timeline.vue

src/client/ui/zen.vue

@@ -94,7 +94,7 @@ export default defineComponent({
 			-webkit-backdrop-filter: blur(32px);
 			backdrop-filter: blur(32px);
 			background-color: var(--header);
-			border-bottom: solid 1px var(--divider);
+			border-bottom: solid 0.5px var(--divider);
 		}
 
 		> main {