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.

agent/nodes.py

@@ -565,8 +565,9 @@ def _log_ocr_layers(state: AgentState) -> None:
     # ── 位置层：布局 schema（行/列/区域）──
     layout = state.get("layout_schema")
     if isinstance(layout, dict) and layout.get("total_rows", 0) > 0:
-        regions = layout.get("regions", {})
-        region_names = list(regions.keys()) if regions else []
+        region_list = layout.get("regions", [])
+        _rn = {"title": "标题", "header": "表头", "data": "数据", "footer": "表尾"}
+        region_names = [_rn.get(r["type"], r["type"]) for r in region_list] if isinstance(region_list, list) else []
         cols = layout.get("total_columns", 0)
         rows = layout.get("total_rows", 0)
         regions_label = ", ".join(region_names) if region_names else "标题/表头/数据/表尾"