feat(frontend): expose id via scoped slot in FormField

When using FormField with custom slot content, the slotted element
needs access to the generated inputId to ensure the label's for
attribute matches the input's id. This exposes the id via the
default slot: <template #default="{ id }">

frontend/src/components/input/FormField.vue

@@ -76,7 +76,7 @@ defineExpose({
 		</label>
 
 		<div :class="controlClasses">
-			<slot>
+			<slot :id="inputId">
 				<input
 					:id="inputId"
 					ref="inputRef"