feat(renderer): lib/toast.ts typed wrappers over sonner

src/renderer/lib/toast.ts

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+import { toast as sonnerToast } from 'sonner';
+
+/**
+ * Typed wrappers over sonner's toast API. Centralizing the import gives us
+ * a single surface to evolve (e.g., add brand colors, action buttons,
+ * analytics) without touching every call site.
+ */
+export const toast = {
+  success: (message: string) => sonnerToast.success(message),
+  error: (message: string) => sonnerToast.error(message),
+  info: (message: string) => sonnerToast.info(message),
+  warning: (message: string) => sonnerToast.warning(message),
+  promise: <T>(
+    promise: Promise<T>,
+    msgs: {
+      loading: string;
+      success: string | ((data: T) => string);
+      error: string | ((err: unknown) => string);
+    }
+  ) => sonnerToast.promise(promise, msgs),
+  dismiss: (id?: string | number) => sonnerToast.dismiss(id),
+};

tests/unit/lib/toast.test.ts

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+import { describe, it, expect, vi, beforeEach } from 'vitest';
+
+vi.mock('sonner', () => ({
+  toast: {
+    success: vi.fn(),
+    error: vi.fn(),
+    info: vi.fn(),
+    warning: vi.fn(),
+    promise: vi.fn(),
+    dismiss: vi.fn(),
+  },
+}));
+
+import { toast } from '@/lib/toast';
+import { toast as sonnerToast } from 'sonner';
+
+describe('toast helpers', () => {
+  beforeEach(() => {
+    vi.clearAllMocks();
+  });
+
+  it('toast.success forwards to sonner with the message', () => {
+    toast.success('Saved test.md');
+    expect(sonnerToast.success).toHaveBeenCalledWith('Saved test.md');
+  });
+
+  it('toast.error forwards to sonner with the message', () => {
+    toast.error('Failed to save: ENOENT');
+    expect(sonnerToast.error).toHaveBeenCalledWith('Failed to save: ENOENT');
+  });
+
+  it('toast.info forwards to sonner with the message', () => {
+    toast.info('Update available');
+    expect(sonnerToast.info).toHaveBeenCalledWith('Update available');
+  });
+
+  it('toast.warning forwards to sonner with the message', () => {
+    toast.warning('Disk space low');
+    expect(sonnerToast.warning).toHaveBeenCalledWith('Disk space low');
+  });
+
+  it('toast.promise forwards the promise and messages to sonner', async () => {
+    const promise = Promise.resolve('ok');
+    const msgs = { loading: 'Loading…', success: 'Done', error: 'Failed' };
+    toast.promise(promise, msgs);
+    expect(sonnerToast.promise).toHaveBeenCalledWith(promise, msgs);
+  });
+});