fix(dashboard): replace text-brand-navy dark:text-brand-mint with text-ink

text-ink uses --c-ink which is #012851 in light and #f0efe9 in dark, responding
to both @media and [data-theme='dark'] via CSS variable — no extra token needed.

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

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

@@ -73,11 +73,11 @@ describe('ReaderDraftsModule', () => {
 		expect(cls).toMatch(/min-h-\[44px\]/);
 	});
 
-	it('draft title has text-brand-navy class', async () => {
+	it('draft title has text-ink class', async () => {
 		render(ReaderDraftsModule, { drafts: [draft1] });
 		const link = page.getByRole('link', { name: /Mein erster Entwurf/ });
 		const el = (await link.element()) as HTMLElement;
-		const titleEl = el.querySelector('[class*="text-brand-navy"]');
+		const titleEl = el.querySelector('[class*="text-ink"]');
 		expect(titleEl).not.toBeNull();
 		expect(titleEl?.textContent?.trim()).toBe('Mein erster Entwurf');
 	});