Preserve conversation excerpts and deduplicate case evidence

src/routes/moderation/cases/[id]/+page.svelte

@@ -28,6 +28,8 @@
     import CopyValue from '$ui/components/CopyValue.svelte';
     import ServerIdentity from '$ui/components/ServerIdentity.svelte';
     import ModerationDialog from '$ui/components/moderation/ModerationDialog.svelte';
+    import EvidenceMessages from '$ui/components/moderation/EvidenceMessages.svelte';
+    import { preservedConversation } from '$ui/moderation-evidence.js';
 
     let { data }: { data: { moderationCase: ModerationCaseDetail } } = $props();
     let snapshot = $state<ModerationCaseDetail | null>(null);
@@ -179,7 +181,8 @@
                 round: Number.isInteger(value.entry?.context?.round)
                     ? (value.entry.context.round as number)
                     : null,
-                original: JSON.stringify(value, null, 2)
+                original: JSON.stringify(value, null, 2),
+                excerpt: preservedConversation(value)
             };
         } catch {
             return null;
@@ -280,7 +283,9 @@
                                             >Round {archive.round}</Badge
                                         >{/if}
                                 </div>
-                                <blockquote>{evidence.text}</blockquote>
+                                {#if archive?.excerpt}
+                                    <EvidenceMessages {...archive.excerpt} />
+                                {:else}<blockquote>{evidence.text}</blockquote>{/if}
                                 <p class="hint">{evidence.source}</p>
                                 {#if archive}<div class="source-context">
                                         {#if archive.matchId}<a