fix creation chat initial progress

docs/technical/CREATION_FLOW_CHAIN_REFACTOR_EXECUTION_PLAN_2026-04-21.md

@@ -308,6 +308,7 @@
 2. 壳层文件内不再直接包含自动保存防抖实现。
 3. 壳层文件内不再直接包含 session -> result profile 编译细节。
 4. 壳层文件内不再直接处理 works/library/history/save 的多路请求编排。
+5. Agent 聊天工作区进入时必须如实展示后端 session 的 `progressPercent`。新会话后端初始值为 `0` 时，前端数字与进度条填充都必须保持 `0%`；只允许对大于 0 的值使用视觉最小宽度，避免用户误判聊天流程已经推进。
 
 ## 5.2 custom world 专属 client 拆分方案
 

src/components/creation-agent/CreationAgentWorkspace.test.tsx

@@ -32,6 +32,37 @@ function ensureScrollApis() {
   }
 }
 
+test('creation agent workspace keeps initial chat progress at zero percent', () => {
+  ensureScrollApis();
+
+  render(
+    <CreationAgentWorkspace
+      session={{
+        sessionId: 'creation-agent-session-1',
+        title: null,
+        currentTurn: 0,
+        progressPercent: 0,
+        anchors: [],
+        messages: [],
+      }}
+      theme={testTheme}
+      loadingText="正在准备"
+      composerPlaceholder="输入消息"
+      primaryActionLabel="生成结果页"
+      onBack={() => {}}
+      onSubmitText={() => {}}
+      onPrimaryAction={() => {}}
+    />,
+  );
+
+  const progressbar = screen.getByRole('progressbar');
+
+  expect(progressbar.getAttribute('aria-valuenow')).toBe('0');
+  expect((progressbar.firstElementChild as HTMLElement | null)?.style.width).toBe(
+    '0%',
+  );
+});
+
 test('creation agent workspace filters duplicate recommended replies', () => {
   const consoleErrorSpy = vi
     .spyOn(console, 'error')

src/components/creation-agent/CreationAgentWorkspace.tsx

@@ -311,6 +311,7 @@ export function CreationAgentWorkspace({
   }
 
   const progress = normalizeCreationAgentProgress(session.progressPercent);
+  const progressFillWidth = progress <= 0 ? '0%' : `${Math.max(6, progress)}%`;
   const hasHeroCopy = Boolean(session.title || session.assistantSummary);
   const canShowPrimaryAction = progress >= 100;
   const visibleQuickActions = quickActions.filter((action) =>
@@ -414,10 +415,16 @@ export function CreationAgentWorkspace({
               {progress}%
             </span>
           </div>
-          <div className="h-2 overflow-hidden rounded-full bg-white/12">
+          <div
+            className="h-2 overflow-hidden rounded-full bg-white/12"
+            role="progressbar"
+            aria-valuemin={0}
+            aria-valuemax={100}
+            aria-valuenow={progress}
+          >
             <div
               className={`h-full rounded-full transition-all ${theme.accentBgClass}`}
-              style={{ width: `${Math.max(6, progress)}%` }}
+              style={{ width: progressFillWidth }}
             />
           </div>
           <div className="mt-2 text-xs leading-5 text-white/64">