Add file editing capability with CodeMirror 6 integration, loading indicator for searches, and clickable home logo

backend/main.py

@@ -195,6 +195,39 @@ async def api_file_download(vault_name: str, path: str = Query(..., description=
     )
 
 
+@app.put("/api/file/{vault_name}/save")
+async def api_file_save(vault_name: str, path: str = Query(..., description="Relative path to file"), body: dict = {}):
+    """Save file content."""
+    vault_data = get_vault_data(vault_name)
+    if not vault_data:
+        raise HTTPException(status_code=404, detail=f"Vault '{vault_name}' not found")
+
+    vault_root = Path(vault_data["path"])
+    file_path = vault_root / path
+
+    # Security: ensure path is within vault
+    try:
+        file_path.resolve().relative_to(vault_root.resolve())
+    except ValueError:
+        raise HTTPException(status_code=403, detail="Access denied: path outside vault")
+
+    if not file_path.exists():
+        raise HTTPException(status_code=404, detail=f"File not found: {path}")
+
+    # Get content from body
+    content = body.get('content', '')
+    
+    try:
+        file_path.write_text(content, encoding="utf-8")
+        logger.info(f"File saved: {vault_name}/{path}")
+        return {"status": "ok", "vault": vault_name, "path": path, "size": len(content)}
+    except PermissionError:
+        raise HTTPException(status_code=403, detail="Permission denied: vault may be read-only")
+    except Exception as e:
+        logger.error(f"Error saving file {vault_name}/{path}: {e}")
+        raise HTTPException(status_code=500, detail=f"Error saving file: {str(e)}")
+
+
 @app.get("/api/file/{vault_name}")
 async def api_file(vault_name: str, path: str = Query(..., description="Relative path to file")):
     """Return rendered HTML + metadata for a file."""