fix: search palette triggers highlight, restore CSS keyframe blink

- SearchPalette now calls requestHighlight(id) before goto()
- Restore smooth CSS @keyframes cardHighlight (0%→none, 25%→glow,
  75%→glow, 100%→none) instead of JS interval pulse
- Inline style.animation overrides class-based stagger animation;
  cleanup sets animation:'none' (inline beats class, no stagger replay)

frontend/src/lib/components/SearchPalette.svelte

@@ -2,6 +2,7 @@
 	import { goto } from '$app/navigation';
 	import { t } from '$lib/i18n';
 	import MdiIcon from './MdiIcon.svelte';
+	import { requestHighlight } from '$lib/highlight';
 	import {
 		fetchAllCaches,
 		providersCache,
@@ -140,6 +141,7 @@
 
 	function navigateTo(result: SearchResult) {
 		closePalette();
+		requestHighlight(result.id);
 		goto(result.href);
 	}