fix: align get_text_content with original semantics and skip Windows-only test on Linux

- text_utils.py: use ''.join() instead of ' '.join() to preserve original
  part spacing; only extract type='text' dicts, ignore non-text blocks
- session.py: add isinstance guard to skip non-str/list content (restore
  original continue behavior for _get_summary)
- test_multimodal.py: add skipif for test_windows_backslash_path since
  backslash paths are Windows-only

Author: ScarletMercy

chcode/session.py

@@ -83,6 +83,8 @@ async def _get_summary(
             messages = state.values.get("messages", [])
             for msg in messages:
                 if isinstance(msg, HumanMessage):
+                    if not isinstance(msg.content, (str, list)):
+                        continue
                     text = get_text_content(msg.content)
                     text = text.strip().replace("\n", " ")
                     if text:

chcode/utils/text_utils.py

@@ -8,9 +8,7 @@ def get_text_content(content: str | list) -> str:
             if isinstance(part, dict):
                 if part.get("type") == "text":
                     text_parts.append(part.get("text", ""))
-                else:
-                    text_parts.append(f"[{part.get('type', 'image')}]")
-            else:
-                text_parts.append(str(part))
-        return " ".join(text_parts).strip()
+            elif isinstance(part, str):
+                text_parts.append(part)
+        return "".join(text_parts).strip()
     return str(content)

tests/test_multimodal.py

@@ -1,5 +1,6 @@
 """Tests for chcode/utils/multimodal.py — multimodal detection, media encoding, path extraction, message building."""
 
+import sys
 from pathlib import Path
 from unittest.mock import patch
 
@@ -316,14 +317,14 @@ def test_code_reference_not_matched(self, tmp_path):
         result = extract_media_paths("INFO processed output.png successfully", tmp_path)
         assert len(result) == 0
 
+    @pytest.mark.skipif(sys.platform != "win32", reason="Windows-only backslash paths")
     def test_windows_backslash_path(self, tmp_path):
         """Windows-style backslash paths should be matched."""
         from chcode.utils.multimodal import extract_media_paths
 
         img = tmp_path / "test.png"
         img.write_bytes(b"\x00")
 
-        # Use forward slash since Python returns forward slashes on Windows too
         result = extract_media_paths(f"看看 {tmp_path}\\test.png", tmp_path)
         assert len(result) == 1