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

@@ -33,7 +33,7 @@ const { drafts }: Props = $props();
 						class="flex min-h-[44px] items-center justify-between border-b border-line/50 px-3 py-1.5 last:border-b-0 hover:bg-muted focus-visible:ring-2 focus-visible:ring-brand-navy focus-visible:outline-none"
 					>
 						<span class="flex min-w-0 flex-col">
-							<span class="truncate font-serif text-sm text-brand-navy">{draft.title}</span>
+							<span class="truncate font-serif text-sm text-ink">{draft.title}</span>
 							<span class="text-[11px] text-ink-3">
 								{m.dashboard_reader_draft_meta({ relative: relativeTimeDe(new Date(draft.updatedAt)) })}
 							</span>