fix: address PR review comments

- Wrap readFile in try/catch, return 404 for missing attachment files
- Remove unused CollaboratorPopover import from NoteCard
- Make darkMode a proper $state rune for reactivity (add svelte-runes
  polyfill for Vitest so $state works in unit tests)
- Add error toasts for failed share link toggle (non-2xx responses)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/lib/__mocks__/svelte-runes.ts

@@ -0,0 +1,11 @@
+/**
+ * Polyfill Svelte 5 runes for Vitest.
+ * The Svelte compiler transforms these in .svelte and .svelte.ts files,
+ * but Vitest doesn't run the Svelte compiler, so we provide plain-JS stubs.
+ */
+/* eslint-disable @typescript-eslint/no-explicit-any */
+
+(globalThis as any).$state = <T>(initial: T): T => initial;
+(globalThis as any).$derived = <T>(value: T): T => value;
+(globalThis as any).$effect = (_fn: () => void): void => {};
+(globalThis as any).$props = (): any => ({});

src/lib/components/NoteCard.svelte

@@ -4,7 +4,6 @@
 	import { renderMarkdown } from '$lib/utils/markdown.js';
 	import { togglePin, trashNote, archiveNote, unarchiveNote, restoreNote, deleteNote, leaveNote, currentFilter } from '$lib/stores/notes.js';
 	import ImageLightbox from './ImageLightbox.svelte';
-	import CollaboratorPopover from './CollaboratorPopover.svelte';
 	import SharingIndicator from './SharingIndicator.svelte';
 	import type { Note } from '$lib/types/index.js';
 	import Undo2 from 'lucide-svelte/icons/undo-2';

src/lib/components/ShareDialog.svelte

@@ -43,20 +43,24 @@
 		try {
 			if (publicShareToken) {
 				const res = await fetch(`/api/notes/${noteId}/share`, { method: 'DELETE' });
-				if (res.ok) {
+				if (!res.ok) {
+					showToast('Failed to remove share link', 'error');
+					return;
+				}
 				publicShareToken = null;
 				onShareUpdate(null);
 				showToast('Public link removed', 'success');
-				}
 			} else {
 				const res = await fetch(`/api/notes/${noteId}/share`, { method: 'POST' });
-				if (res.ok) {
+				if (!res.ok) {
+					showToast('Failed to create share link', 'error');
+					return;
+				}
 				const data = await res.json();
 				publicShareToken = data.token;
 				onShareUpdate(data.token);
 				showToast('Public link created', 'success');
 			}
-			}
 		} catch {
 			showToast('Failed to update share link', 'error');
 		} finally {

src/lib/utils/theme.svelte.ts

@@ -3,7 +3,7 @@ import { browser } from '$app/environment';
 const LIGHT_THEME_COLOR = '#f0e6d3';
 const DARK_THEME_COLOR = '#1a1715';
 
-let darkMode = false;
+let darkMode = $state(false);
 
 export function getIsDarkMode(): boolean {
 	return darkMode;

src/routes/api/shared/[token]/attachment/[attachmentId]/+server.ts

@@ -26,6 +26,7 @@ export const GET: RequestHandler = async ({ params, url, getClientAddress }) =>
 	const filePath = wantThumb && attachment.thumbnailPath ? attachment.thumbnailPath : attachment.path;
 	const mimeType = wantThumb && attachment.thumbnailPath ? 'image/webp' : attachment.mimeType;
 
+	try {
 		const buffer = await readFile(filePath);
 		return new Response(buffer, {
 			headers: {
@@ -34,4 +35,7 @@ export const GET: RequestHandler = async ({ params, url, getClientAddress }) =>
 				'Cache-Control': 'public, max-age=3600'
 			}
 		});
+	} catch {
+		throw error(404, 'Attachment not found');
+	}
 };

vitest.config.ts

@@ -11,6 +11,7 @@ export default defineConfig({
 	test: {
 		include: ['src/**/*.test.ts'],
 		environment: 'node',
+		setupFiles: ['src/lib/__mocks__/svelte-runes.ts'],
 		coverage: {
 			provider: 'v8',
 			reporter: ['text', 'html', 'lcov', 'json-summary'],