Revert PR #200 (custom theme consolidation) - broke search

src/lib/components/CommandPalette.svelte

@@ -1,7 +1,7 @@
 <script lang="ts">
 	import { showCommandPalette, showSearch, theme, sourceMode, viewMode, activeNotebook, activeTag } from '$lib/stores/app';
 	import { setTheme, reindex } from '$lib/api';
-	import { applyTheme } from '$lib/platform';
+	import { darkThemes } from '$lib/platform';
 
 	// onNavigate runs the parent's view-change handler (refreshes the note list and reveals it
 	// if it was hidden), so opening a view here behaves exactly like clicking it in the sidebar.
@@ -179,6 +179,18 @@
 		}
 	}
 
+	function applyTheme(t: string) {
+		const namedThemes = ['solarized-light', 'solarized-dark', 'catppuccin', 'nord', 'tokyo-night', 'github-light', 'github-dark', 'dracula', 'blueberry', 'forest-green', 'gruvbox', 'midnight-tide', 'cherry-blossom', 'synthwave', 'ember', 'moonlit', 'light-coffee', 'dark-coffee', 'cotton-candy', 'crimson', 'cloud', 'peach', 'material-dark', 'material-light', 'monokai', 'rose-pine', 'everforest', 'horizon', 'cyberpunk', 'black', 'one-dark'];
+		const root = document.documentElement;
+		root.classList.remove('dark');
+		root.removeAttribute('data-theme');
+		if (namedThemes.includes(t)) {
+			root.setAttribute('data-theme', t);
+			if (darkThemes.includes(t)) root.classList.add('dark');
+		} else if (t === 'dark' || (t === 'system' && window.matchMedia('(prefers-color-scheme: dark)').matches)) {
+			root.classList.add('dark');
+		}
+	}
 </script>
 
 {#if $showCommandPalette}