feat(admin): add OCR admin routes — overview, global history, sender detail

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

frontend/src/routes/admin/ocr/global/+page.svelte

@@ -0,0 +1,30 @@
+<script lang="ts">
+import type { PageData } from './$types';
+import TrainingHistory from '$lib/components/TrainingHistory.svelte';
+
+let { data }: { data: PageData } = $props();
+</script>
+
+<div class="flex flex-col gap-6 p-6">
+	<div class="flex items-center gap-4">
+		<a
+			href="/admin/ocr"
+			class="group inline-flex items-center text-xs font-bold tracking-widest text-gray-500 uppercase transition-colors hover:text-brand-navy"
+		>
+			<svg
+				class="mr-2 h-4 w-4 transform transition-transform group-hover:-translate-x-1"
+				fill="none"
+				viewBox="0 0 24 24"
+				stroke="currentColor"
+				stroke-width="2"
+				><path stroke-linecap="round" stroke-linejoin="round" d="M15 19l-7-7 7-7" /></svg
+			>
+			OCR
+		</a>
+		<h1 class="font-sans text-lg font-bold tracking-widest text-brand-navy uppercase">
+			Global History
+		</h1>
+	</div>
+
+	<TrainingHistory runs={data.history.runs ?? []} personNames={data.history.personNames ?? {}} />
+</div>