feat: add memory candidates viewer with filtering and confidence visualization

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

src/lib/components/MemoryCandidateCard.svelte

@@ -0,0 +1,51 @@
+<script lang="ts">
+	import { ResultSource } from '$lib/proto/llm_multiverse/v1/common_pb';
+	import type { StoredMemoryCandidate } from '$lib/stores/memory.svelte';
+
+	let { candidate }: { candidate: StoredMemoryCandidate } = $props();
+
+	const sourceBadge = $derived.by(() => {
+		switch (candidate.source) {
+			case ResultSource.TOOL_OUTPUT:
+				return { label: 'Tool Output', bg: 'bg-blue-100', text: 'text-blue-800' };
+			case ResultSource.MODEL_KNOWLEDGE:
+				return { label: 'Model Knowledge', bg: 'bg-purple-100', text: 'text-purple-800' };
+			case ResultSource.WEB:
+				return { label: 'Web', bg: 'bg-green-100', text: 'text-green-800' };
+			default:
+				return { label: 'Unspecified', bg: 'bg-gray-100', text: 'text-gray-800' };
+		}
+	});
+
+	const confidencePct = $derived(Math.round(candidate.confidence * 100));
+
+	const confidenceColor = $derived.by(() => {
+		if (candidate.confidence >= 0.8) return { bar: 'bg-green-500', text: 'text-green-700' };
+		if (candidate.confidence >= 0.5) return { bar: 'bg-amber-500', text: 'text-amber-700' };
+		return { bar: 'bg-red-500', text: 'text-red-700' };
+	});
+</script>
+
+<div class="rounded-lg border border-gray-200 bg-white p-4">
+	<div class="mb-2 flex items-center justify-between gap-2">
+		<span
+			class="shrink-0 rounded-full px-2.5 py-0.5 text-xs font-medium {sourceBadge.bg} {sourceBadge.text}"
+		>
+			{sourceBadge.label}
+		</span>
+		<span class="text-xs font-medium {confidenceColor.text}">
+			{confidencePct}%
+		</span>
+	</div>
+
+	<p class="mb-3 text-sm text-gray-700">{candidate.content}</p>
+
+	<div class="flex items-center gap-2">
+		<div class="h-2 flex-1 overflow-hidden rounded-full bg-gray-100">
+			<div
+				class="h-full rounded-full transition-all {confidenceColor.bar}"
+				style="width: {confidencePct}%"
+			></div>
+		</div>
+	</div>
+</div>