Add setting to toggle link arrows (#128)

src/routes/+layout.svelte

@@ -16,6 +16,13 @@
 		applyTheme($theme);
 	});
 
+	// Apply link arrow visibility from config
+	$effect(() => {
+		if ($appConfig) {
+			document.documentElement.classList.toggle('no-link-arrows', !$appConfig.show_link_arrows);
+		}
+	});
+
 	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;