fix: crash 'list' object has no attribute 'keys' on image upload, output disappearing on error

Root cause: layout_schema.regions is a list of region dicts, not a dict.
_log_ocr_layers() was calling .keys() on it, causing agent_error.

Also fixed: ProcessSection now stays visible after streaming ends (error or
completion), so generated content is not lost. Header shows ✓/✕/pulse indicators.
Error handler now refreshes session state for partial JRXML download.

frontend/src/App.vue

@@ -103,6 +103,7 @@ async function handleSend(text: string, files: File[]) {
       onAgentError(data) {
         chat.setError(data.error)
         chat.addMessage({ role: 'assistant', content: `执行异常: ${data.error}`, type: 'error' })
+        setTimeout(() => session.refreshFromState({}), 500)
       },
     })
   } catch (e: any) {

frontend/src/components/ProcessSection.vue

@@ -15,10 +15,20 @@ function isXmlLike(text: string): boolean {
 </script>
 
 <template>
-  <div v-if="chat.streaming && chat.sections.length > 0" class="process-sections">
+  <div v-if="chat.sections.length > 0" class="process-sections">
     <div class="sections-header">
-      <span class="pulse-dot"></span>
-      处理中 · {{ chat.formatDuration(chat.totalDurationMs) }}
+      <template v-if="chat.streaming">
+        <span class="pulse-dot"></span>
+        处理中 · {{ chat.formatDuration(chat.totalDurationMs) }}
+      </template>
+      <template v-else-if="chat.error">
+        <span class="error-icon">✕</span>
+        执行异常 · {{ chat.formatDuration(chat.totalDurationMs) }}
+      </template>
+      <template v-else>
+        <span class="done-icon">✓</span>
+        完成 · {{ chat.formatDuration(chat.totalDurationMs) }}
+      </template>
     </div>
 
     <details
@@ -76,6 +86,18 @@ function isXmlLike(text: string): boolean {
   animation: pulse 1.5s infinite;
 }
 
+.error-icon {
+  color: #f38ba8;
+  font-weight: bold;
+  font-size: 12px;
+}
+
+.done-icon {
+  color: #a6e3a1;
+  font-weight: bold;
+  font-size: 12px;
+}
+
 @keyframes pulse {
   0%, 100% { opacity: 1; }
   50% { opacity: 0.3; }