frontend/src/routes/conversations/+page.svelte

@@ -92,29 +92,31 @@ const enrichedDocuments = $derived(
 			</div>
 
 			<!-- Swap button — icon-only on desktop, full-width with text on mobile -->
-			<div class="flex items-end">
-				<button
-					data-testid="conv-swap-btn"
-					onclick={swapPersons}
-					class="flex w-full items-center justify-center gap-2 border border-brand-sand px-3 py-2.5 text-xs font-bold tracking-widest text-brand-navy uppercase transition-colors hover:bg-brand-navy hover:text-white md:w-auto"
-					title={m.conv_swap_btn()}
-				>
-					<svg
-						class="h-4 w-4 flex-shrink-0 md:rotate-90"
-						fill="none"
-						stroke="currentColor"
-						viewBox="0 0 24 24"
+			{#if senderId && receiverId}
+				<div class="flex items-end">
+					<button
+						data-testid="conv-swap-btn"
+						onclick={swapPersons}
+						class="flex w-full items-center justify-center gap-2 border border-brand-sand px-3 py-2.5 text-xs font-bold tracking-widest text-brand-navy uppercase transition-colors hover:bg-brand-navy hover:text-white md:w-auto"
+						title={m.conv_swap_btn()}
 					>
-						<path
-							stroke-linecap="round"
-							stroke-linejoin="round"
-							stroke-width="2"
-							d="M7 16V4m0 0L3 8m4-4l4 4M17 8v12m0 0l4-4m-4 4l-4-4"
-						></path>
-					</svg>
-					<span class="md:hidden">{m.conv_swap_btn()}</span>
-				</button>
-			</div>
+						<svg
+							class="h-4 w-4 flex-shrink-0 md:rotate-90"
+							fill="none"
+							stroke="currentColor"
+							viewBox="0 0 24 24"
+						>
+							<path
+								stroke-linecap="round"
+								stroke-linejoin="round"
+								stroke-width="2"
+								d="M7 16V4m0 0L3 8m4-4l4 4M17 8v12m0 0l4-4m-4 4l-4-4"
+							></path>
+						</svg>
+						<span class="md:hidden">{m.conv_swap_btn()}</span>
+					</button>
+				</div>
+			{/if}
 
 			<!-- Receiver -->
 			<div