feat: unify creation entry templates

src/components/creative-agent/CreativeAgentWorkspace.tsx

@@ -28,6 +28,7 @@ type CreativeAgentWorkspaceProps = {
   error: string | null;
   eventLog: CreativeAgentSseEvent[];
   onBack: () => void;
+  showBackButton?: boolean;
   onSubmitMessage: (payload: {
     clientMessageId: string;
     content: CreativeAgentInputPart[];
@@ -101,6 +102,7 @@ export function CreativeAgentWorkspace({
   error,
   eventLog,
   onBack,
+  showBackButton = true,
   onSubmitMessage,
   onConfirmTemplate,
   onCancelTemplate,
@@ -131,17 +133,21 @@ export function CreativeAgentWorkspace({
   return (
     <div className="platform-remap-surface mx-auto flex h-full min-h-0 w-full flex-col xl:max-w-[min(100%,88rem)] xl:px-1">
       <div className="mb-3 flex items-center justify-between gap-3">
-        <button
-          type="button"
-          onClick={onBack}
-          disabled={isBusy}
-          className={`platform-button platform-button--ghost min-h-0 px-3 py-1.5 text-[11px] ${isBusy ? 'opacity-45' : ''}`}
-        >
-          <span className="inline-flex items-center gap-1.5">
-            <ArrowLeft className="h-3.5 w-3.5" />
-            返回
-          </span>
-        </button>
+        {showBackButton ? (
+          <button
+            type="button"
+            onClick={onBack}
+            disabled={isBusy}
+            className={`platform-button platform-button--ghost min-h-0 px-3 py-1.5 text-[11px] ${isBusy ? 'opacity-45' : ''}`}
+          >
+            <span className="inline-flex items-center gap-1.5">
+              <ArrowLeft className="h-3.5 w-3.5" />
+              返回
+            </span>
+          </button>
+        ) : (
+          <span aria-hidden="true" />
+        )}
         <div className="platform-pill platform-pill--cool px-3 text-[11px]">
           {CREATIVE_AGENT_STAGE_LABEL[stage]}
         </div>