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/ReaderRecentDocs.svelte

@@ -61,7 +61,7 @@ function isNew(doc: Document): boolean {
 							<span class="truncate font-serif text-sm text-ink">{doc.title}</span>
 							{#if isNew(doc)}
 								<span
-									class="shrink-0 rounded-full bg-mint-soft px-1.5 py-px text-[11px] font-bold text-brand-navy dark:bg-mint-soft dark:text-brand-mint"
+									class="shrink-0 rounded-full bg-mint-soft px-1.5 py-px text-[11px] font-bold text-ink dark:bg-mint-soft"
 								>
 									{m.dashboard_badge_new()}
 								</span>