Fix #63: decide layout from compile-time platform, not the webview user-agent

src/lib/components/SearchPanel.svelte

@@ -3,6 +3,7 @@
 	import { searchNotes, readNote } from '$lib/api';
 	import { debounce } from '$lib/utils/debounce';
 	import type { SearchResult } from '$lib/types';
+	import { isMobile } from '$lib/platform';
 
 	let query = $state('');
 	let results = $state<SearchResult[]>([]);
@@ -83,8 +84,6 @@
 		return str.replace(/&/g, '&amp;').replace(/</g, '&lt;').replace(/>/g, '&gt;');
 	}
 
-	const isMobile = /android|iphone|ipad|ipod/i.test(navigator.userAgent);
-
 	async function openResult(result: SearchResult) {
 		try {
 			const content = await readNote(result.path);