Add fallback parser for markdown files with invalid YAML frontmatter to prevent indexing failures

backend/main.py

@@ -16,6 +16,7 @@ from backend.indexer import (
     index,
     get_vault_data,
     find_file_in_index,
+    parse_markdown_file,
     SUPPORTED_EXTENSIONS,
 )
 from backend.search import search, get_all_tags
@@ -211,7 +212,7 @@ async def api_file(vault_name: str, path: str = Query(..., description="Relative
     ext = file_path.suffix.lower()
 
     if ext == ".md":
-        post = frontmatter.loads(raw)
+        post = parse_markdown_file(raw)
 
         # Extract metadata
         tags = post.metadata.get("tags", [])