fix(#93): migrate hardcoded text-gray-400/500 to semantic ink tokens

enrich/+page.svelte back link: text-gray-500 → text-ink-2 / hover:text-ink
enrich/done/+page.svelte body text: text-gray-500 → text-ink-2
enrich/done/+page.svelte list link: text-gray-400 (2.6:1, fails AA) → text-ink-2

Root fix for section label contrast (text-ink-3 uppercase pattern used
app-wide) is in PR #107 via the ink-3 token value change.

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

frontend/src/routes/enrich/done/+page.svelte

@@ -17,7 +17,7 @@ import { m } from '$lib/paraglide/messages.js';
 			{m.enrich_done_heading()}
 		</h1>
 
-		<p class="mt-2 max-w-xs font-sans text-sm text-gray-500">
+		<p class="mt-2 max-w-xs font-sans text-sm text-ink-2">
 			{m.enrich_done_body()}
 		</p>
 
@@ -31,7 +31,7 @@ import { m } from '$lib/paraglide/messages.js';
 
 			<a
 				href="/enrich"
-				class="font-sans text-xs text-gray-400 underline-offset-4 transition-colors hover:text-brand-navy hover:underline"
+				class="font-sans text-xs text-ink-2 underline-offset-4 transition-colors hover:text-ink hover:underline"
 			>
 				{m.enrich_back_to_list()}
 			</a>