fix: navigate to home when deleting active chat + text selection CSS

- ConversationItem now navigates to / when deleting the currently active chat
- Added text selection styling (violet highlight) for better visibility in dark theme

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

frontend/src/app.css

@@ -8,6 +8,15 @@ body {
 	@apply h-full;
 }
 
+/* Text selection styling for dark theme */
+::selection {
+	@apply bg-violet-500/40 text-white;
+}
+
+::-moz-selection {
+	@apply bg-violet-500/40 text-white;
+}
+
 /* Custom scrollbar */
 ::-webkit-scrollbar {
 	@apply w-2;

frontend/src/lib/components/layout/ConversationItem.svelte

@@ -4,7 +4,8 @@
 	 * Shows title, model, and hover actions (pin, delete)
 	 */
 	import type { Conversation } from '$lib/types/conversation.js';
-	import { conversationsState, uiState } from '$lib/stores';
+	import { goto } from '$app/navigation';
+	import { conversationsState, uiState, chatState } from '$lib/stores';
 	import { deleteConversation } from '$lib/storage';
 
 	interface Props {
@@ -40,11 +41,20 @@
 	async function handleDelete(e: MouseEvent) {
 		e.preventDefault();
 		e.stopPropagation();
+
+		const isCurrentChat = chatState.conversationId === conversation.id;
+
 		// Delete from IndexedDB first
 		const result = await deleteConversation(conversation.id);
 		if (result.success) {
 			// Then remove from state
 			conversationsState.remove(conversation.id);
+
+			// If deleting the active chat, navigate home
+			if (isCurrentChat) {
+				chatState.reset();
+				goto('/');
+			}
 		} else {
 			console.error('Failed to delete conversation:', result.error);
 		}