feat(dashboard): add reader dashboard components

Adds 5 new components for the permission-gated reader layout:
- ReaderStatsStrip: stat tiles (documents / persons / stories) linking to list pages
- ReaderPersonChips: top-N persons by doc count with avatar + name
- ReaderDraftsModule: blog draft list for BLOG_WRITE users
- ReaderRecentDocs: 5 most-recently-updated docs with Neu/Aktualisiert badge
- ReaderRecentStories: 3 latest published stories with 150-char HTML-stripped excerpt

Each component ships with a vitest-browser spec covering the key assertions.
Avatar color/initials logic is inlined to satisfy $lib/shared → $lib/person
boundary rule.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

frontend/src/lib/shared/dashboard/ReaderStatsStrip.svelte.spec.ts

@@ -0,0 +1,37 @@
+import { describe, it, expect, afterEach } from 'vitest';
+import { cleanup, render } from 'vitest-browser-svelte';
+import { page } from 'vitest/browser';
+
+import ReaderStatsStrip from './ReaderStatsStrip.svelte';
+
+afterEach(() => {
+	cleanup();
+});
+
+describe('ReaderStatsStrip', () => {
+	it('renders a link to /documents', async () => {
+		render(ReaderStatsStrip, { documents: 42, persons: 7, stories: 3 });
+		const link = page.getByRole('link', { name: /42/ });
+		await expect.element(link).toHaveAttribute('href', '/documents');
+	});
+
+	it('renders a link to /persons', async () => {
+		render(ReaderStatsStrip, { documents: 42, persons: 7, stories: 3 });
+		const link = page.getByRole('link', { name: /7/ });
+		await expect.element(link).toHaveAttribute('href', '/persons');
+	});
+
+	it('renders a link to /geschichten', async () => {
+		render(ReaderStatsStrip, { documents: 42, persons: 7, stories: 3 });
+		const link = page.getByRole('link', { name: /3/ });
+		await expect.element(link).toHaveAttribute('href', '/geschichten');
+	});
+
+	it('shows "—" when documents count is null', async () => {
+		render(ReaderStatsStrip, { documents: null, persons: null, stories: null });
+		const links = page.getByRole('link');
+		await expect.element(links.first()).toBeInTheDocument();
+		const text = ((await links.first().element()) as HTMLElement).textContent;
+		expect(text).toContain('—');
+	});
+});