fix: lock session intake after creation

src/app/page.tsx

@@ -344,6 +344,7 @@ export default function Home() {
 
           <div className="space-y-8">
             <PromptPanel
+              session={current}
               onGenerate={handleGenerate}
               onUploadProject={handleUploadProject}
               loading={loading}

src/components/PromptPanel.tsx

@@ -1,6 +1,7 @@
 'use client';
 
 import { useRef, useState } from 'react';
+import type { GenSession, ProjectInputMode, UploadedImage } from '@/lib/types';
 
 const PRESET_STYLES = [
   { id: 'plush', label: '毛绒玩偶' },
@@ -17,6 +18,7 @@ type UploadProjectFile = {
 };
 
 export type PromptPanelProps = {
+  session: GenSession | null;
   onGenerate: (opts: { prompt: string; refImages: string[]; count: number; style?: string }) => void;
   onUploadProject: (opts: {
     mode: 'remix' | 'replicate';
@@ -35,7 +37,90 @@ function filePreview(file: File | null) {
   return file ? URL.createObjectURL(file) : '';
 }
 
-export default function PromptPanel({ onGenerate, onUploadProject, loading, uploadLoading }: PromptPanelProps) {
+function tabFromMode(mode?: ProjectInputMode): Tab {
+  if (mode === 'remix') return 'remix';
+  if (mode === 'replicate' || mode === 'extend') return 'replicate';
+  return 'idea';
+}
+
+function modeLabel(mode?: ProjectInputMode) {
+  if (mode === 'remix') return '二创';
+  if (mode === 'replicate') return '复刻';
+  if (mode === 'extend') return '复制';
+  return '想法';
+}
+
+function imageSourcesForSession(session: GenSession) {
+  const uploaded = session.uploadedImages?.map(image => image.url) ?? [];
+  return uploaded.length ? uploaded : session.refImages;
+}
+
+function uploadedLabel(image: UploadedImage) {
+  if (image.role === 'subject') return '主体图';
+  if (image.role === 'reference') return '参考图';
+  return image.accessoryName || image.role;
+}
+
+function LockedSessionInput({ session }: { session: GenSession }) {
+  const images = imageSourcesForSession(session);
+  return (
+    <div className="rounded-[8px] border border-[#e6f578]/18 bg-[#e6f578]/[0.035] p-4">
+      <div className="flex flex-wrap items-center justify-between gap-3">
+        <div>
+          <div className="text-[10px] uppercase tracking-[0.18em] text-[#e6f578]/65">Locked session input</div>
+          <div className="mt-1 text-sm font-semibold text-white">本会话入口已锁定 · {modeLabel(session.inputMode)}</div>
+        </div>
+        <div className="rounded-full border border-white/10 bg-black/35 px-3 py-1 text-[11px] text-white/45">
+          要换内容，请从左侧新建会话
+        </div>
+      </div>
+
+      <div className="mt-4 grid gap-3 md:grid-cols-[minmax(0,1fr)_220px]">
+        <div className="rounded-[8px] border border-white/10 bg-black/28 p-3">
+          <div className="mb-1.5 text-[10px] uppercase tracking-[0.14em] text-white/38">Prompt</div>
+          <p className="text-[13px] leading-relaxed text-white/76">{session.prompt || '未填写'}</p>
+        </div>
+        <div className="grid grid-cols-2 gap-2 text-[11px] text-white/54">
+          <div className="rounded-[8px] border border-white/10 bg-black/24 p-3">
+            <div className="text-white/32">数量</div>
+            <div className="mt-1 font-semibold text-white">{session.count} 张</div>
+          </div>
+          <div className="rounded-[8px] border border-white/10 bg-black/24 p-3">
+            <div className="text-white/32">创建时间</div>
+            <div className="mt-1 font-semibold text-white">
+              {new Date(session.createdAt).toLocaleString('zh-CN', { month: '2-digit', day: '2-digit', hour: '2-digit', minute: '2-digit' })}
+            </div>
+          </div>
+        </div>
+      </div>
+
+      <div className="mt-3">
+        <div className="mb-2 text-[10px] uppercase tracking-[0.14em] text-white/38">Reference</div>
+        {images.length ? (
+          <div className="flex flex-wrap gap-2.5">
+            {images.slice(0, 6).map((url, index) => {
+              const uploaded = session.uploadedImages?.find(image => image.url === url);
+              return (
+                <div key={`${url}-${index}`} className="relative h-20 w-20 overflow-hidden rounded-[8px] ring-1 ring-white/[0.1]">
+                  <img src={url} alt={uploaded ? uploadedLabel(uploaded) : `参考图 ${index + 1}`} className="h-full w-full object-cover" />
+                  <div className="absolute bottom-1 left-1 rounded bg-black/70 px-1.5 py-0.5 text-[9px] text-white/70">
+                    {uploaded ? uploadedLabel(uploaded) : `参考 ${index + 1}`}
+                  </div>
+                </div>
+              );
+            })}
+          </div>
+        ) : (
+          <div className="rounded-[8px] border border-dashed border-white/10 bg-black/18 px-3 py-4 text-xs text-white/34">
+            本会话没有参考图。
+          </div>
+        )}
+      </div>
+    </div>
+  );
+}
+
+export default function PromptPanel({ session, onGenerate, onUploadProject, loading, uploadLoading }: PromptPanelProps) {
   const [tab, setTab] = useState<Tab>('idea');
   const [prompt, setPrompt] = useState('AI 毛绒陪伴玩具，机甲头盔，胸前挂 M logo，橙白配色，圆胖体型');
   const [refs, setRefs] = useState<string[]>([]);
@@ -86,6 +171,8 @@ export default function PromptPanel({ onGenerate, onUploadProject, loading, uplo
 
   const busy = loading || uploadLoading;
   const replicatePreview = filePreview(replicateFile);
+  const locked = Boolean(session);
+  const activeTab = session ? tabFromMode(session.inputMode) : tab;
 
   return (
     <section className="card p-7 space-y-6">
@@ -102,8 +189,10 @@ export default function PromptPanel({ onGenerate, onUploadProject, loading, uplo
           ].map(([id, label]) => (
             <button
               key={id}
-              onClick={() => setTab(id as Tab)}
+              onClick={() => { if (!locked) setTab(id as Tab); }}
-              className={`seg-item ${tab === id ? 'seg-item-active' : ''}`}
+              disabled={locked}
+              title={locked ? '本会话入口已锁定；从左侧新建会话后可重新选择' : undefined}
+              className={`seg-item ${activeTab === id ? 'seg-item-active' : ''} ${locked ? 'cursor-not-allowed opacity-70' : ''}`}
             >
               {label}
             </button>
@@ -111,7 +200,9 @@ export default function PromptPanel({ onGenerate, onUploadProject, loading, uplo
         </div>
       </div>
 
-      {tab === 'idea' && (
+      {session ? (
+        <LockedSessionInput session={session} />
+      ) : activeTab === 'idea' && (
         <>
           <div>
             <label className="block text-[11px] font-medium text-white/55 uppercase tracking-[0.14em] mb-2.5">
@@ -163,7 +254,7 @@ export default function PromptPanel({ onGenerate, onUploadProject, loading, uplo
         </>
       )}
 
-      {tab === 'remix' && (
+      {!session && activeTab === 'remix' && (
         <div className="space-y-5">
           <div>
             <label className="block text-[11px] font-medium text-white/55 uppercase tracking-[0.14em] mb-2.5">
@@ -212,7 +303,7 @@ export default function PromptPanel({ onGenerate, onUploadProject, loading, uplo
         </div>
       )}
 
-      {tab === 'replicate' && (
+      {!session && activeTab === 'replicate' && (
         <div className="grid md:grid-cols-[220px_1fr] gap-5 items-start">
           <div>
             <label className="block text-[11px] font-medium text-white/55 uppercase tracking-[0.14em] mb-2.5">
@@ -256,7 +347,7 @@ export default function PromptPanel({ onGenerate, onUploadProject, loading, uplo
         </div>
       )}
 
-      {(tab === 'idea' || tab === 'remix') && (
+      {!session && (activeTab === 'idea' || activeTab === 'remix') && (
         <div>
           <label className="block text-[11px] font-medium text-white/55 uppercase tracking-[0.14em] mb-2.5">
             风格
@@ -277,8 +368,8 @@ export default function PromptPanel({ onGenerate, onUploadProject, loading, uplo
         </div>
       )}
 
-      <div className="flex items-end justify-between gap-4 pt-2">
+      {!session && <div className="flex items-end justify-between gap-4 pt-2">
-        {(tab === 'idea' || tab === 'remix') ? (
+        {(activeTab === 'idea' || activeTab === 'remix') ? (
           <div>
             <label className="block text-[11px] font-medium text-white/55 uppercase tracking-[0.14em] mb-2.5">
               数量
@@ -295,12 +386,12 @@ export default function PromptPanel({ onGenerate, onUploadProject, loading, uplo
           </div>
         ) : <div />}
         <button
-          onClick={tab === 'idea' ? submitIdea : tab === 'remix' ? submitRemix : submitReplicate}
+          onClick={activeTab === 'idea' ? submitIdea : activeTab === 'remix' ? submitRemix : submitReplicate}
           disabled={
             busy
-            || (tab === 'idea' && !prompt.trim())
+            || (activeTab === 'idea' && !prompt.trim())
-            || (tab === 'remix' && remixFiles.length === 0)
+            || (activeTab === 'remix' && remixFiles.length === 0)
-            || (tab === 'replicate' && !replicateFile)
+            || (activeTab === 'replicate' && !replicateFile)
           }
           className="btn btn-primary px-5 py-2.5 disabled:opacity-40 disabled:cursor-not-allowed"
         >
@@ -313,14 +404,14 @@ export default function PromptPanel({ onGenerate, onUploadProject, loading, uplo
             </>
           ) : (
             <>
-              {tab === 'idea' ? '批量生成' : tab === 'remix' ? '生成变体' : '复刻并锁定'}
+              {activeTab === 'idea' ? '批量生成' : activeTab === 'remix' ? '生成变体' : '复刻并锁定'}
               <svg width="14" height="14" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2.5">
                 <path d="M5 12h14M13 5l7 7-7 7" strokeLinecap="round" strokeLinejoin="round" />
               </svg>
             </>
           )}
         </button>
-      </div>
+      </div>}
     </section>
   );
 }

src/components/Sidebar.tsx

@@ -64,7 +64,7 @@ export default function Sidebar({
           <svg width="14" height="14" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2.5">
             <path d="M12 5v14M5 12h14" strokeLinecap="round" />
           </svg>
-          新会话
+          新会话 · 重新选择
         </button>
       </div>