Add color-coded persona bubble icon to chat message headers

src/lib/components/chat/ChatMessage.svelte

@@ -13,7 +13,9 @@
 	import CarbonMaximize from "~icons/carbon/maximize";
 	import CarbonMinimize from "~icons/carbon/minimize";
 	import CarbonPen from "~icons/carbon/pen";
+	import CarbonChat from "~icons/carbon/chat";
 	import UploadedFile from "./UploadedFile.svelte";
+	import { getPersonaColor } from "$lib/utils/personaColors";
 
 	import {
 		MessageUpdateType,
@@ -413,20 +415,22 @@ let hasClientThink = $derived(!hasServerReasoning && hasThinkSegments(message.co
 						style={hasMultipleCards && !focusedPersonaId ? `min-width: 320px; max-width: ${isExpanded ? '600px' : '420px'};` : ''}
 						data-persona-id={response.personaId}
 					>
-					<!-- Persona Header: persona name + action buttons -->
+					<!-- Persona Header: color bubble + persona name + action buttons -->
 					<div class="mb-3 flex items-center justify-between border-b border-gray-200 pb-2 dark:border-gray-700">
 						{#if isPersonaMode}
 							<button
 								type="button"
-								class="truncate text-left text-lg font-semibold text-gray-700 hover:text-gray-900 dark:text-gray-200 dark:hover:text-gray-50 transition-colors"
+								class="flex items-center gap-1.5 truncate text-left text-lg font-semibold text-gray-700 hover:text-gray-900 dark:text-gray-200 dark:hover:text-gray-50 transition-colors"
 								onclick={() => openPersonaSettings(response.personaId)}
 								aria-label="Open settings for {displayName}"
 								title="View {displayName} settings"
 							>
+								<CarbonChat class="flex-shrink-0 text-base" style="color: {getPersonaColor(response.personaId)}" />
 								{displayName}
 							</button>
 						{:else}
-							<h3 class="truncate text-lg font-semibold text-gray-700 dark:text-gray-200">
+							<h3 class="flex items-center gap-1.5 truncate text-lg font-semibold text-gray-700 dark:text-gray-200">
+								<CarbonChat class="flex-shrink-0 text-base" style="color: {getPersonaColor(response.personaId)}" />
 								{displayName}
 							</h3>
 						{/if}