Add missing parse_thinking_blocks function

Function was referenced in summarize_streaming but never defined in app.py.
Copied from summarize_transcript.py.

app.py

@@ -56,15 +56,26 @@ def load_model():
         raise
 
 
-def clean_thinking_tags(content: str) -> str:
-    """Remove thinking tags and return clean summary text."""
-    # Remove thinking blocks
-    content = re.sub(r'<thinking>.*?</thinking>', '', content, flags=re.DOTALL)
-    # Remove reasoning blocks if present
-    content = re.sub(r'<reasoning>.*?</reasoning>', '', content, flags=re.DOTALL)
-    # Clean up extra whitespace
-    content = re.sub(r'\n{3,}', '\n\n', content)
-    return content.strip()
+def parse_thinking_blocks(content: str) -> Tuple[str, str]:
+    """
+    Parse thinking blocks from model output.
+
+    Args:
+        content: Full model response
+
+    Returns:
+        Tuple of (thinking_content, summary_content)
+    """
+    pattern = r'<thinking>(.*?)</thinking>'
+    matches = re.findall(pattern, content, re.DOTALL)
+
+    if not matches:
+        return ("", content)
+
+    thinking = '\n\n'.join(match.strip() for match in matches)
+    summary = re.sub(pattern, '', content, flags=re.DOTALL).strip()
+
+    return (thinking, summary)
 
 
 def summarize_streaming(file_obj, max_tokens: int = 512, temperature: float = 0.6) -> Generator[str, None, None]: