style(webui): don't display subdued input text in search header

webui/src/lib/components/layout/Header.svelte

@@ -89,6 +89,7 @@
 			on:input={onInput}
 			bind:this={selector}
 			emptyOptions={lastSearched}
+			selectable={false}
 		>
 			<Icon name="search" slot="prefix" />
 		</Selector>

webui/src/lib/components/utils/Selector.svelte

@@ -108,6 +108,7 @@
 	export let placeholder = '';
 	export let disabled = false;
 	export let keepFocusOnSet = false;
+	export let selectable = true;
 	export let forceShowOptions = false;
 
 	export let initial: SelectorValue | undefined = undefined;
@@ -471,7 +472,7 @@
 			bind:value={inputValue}
 			on:focusChange={(ev) => (inputFocused = ev.detail)}
 			on:keydown={handleArrowKeys}
-			klass={current !== undefined ? '' : 'selector-unset'}
+			klass={current !== undefined || !selectable ? '' : 'selector-unset'}
 			{disabled}
 			{placeholder}
 		>