Update environment variable handling for Hugging Face Spaces

src/streamlit_app.py

@@ -3,8 +3,15 @@ import streamlit as st
 from anthropic import Anthropic
 from dotenv import load_dotenv
 
-# Load environment variables
-load_dotenv()
+# Load environment variables from .env file if it exists (local development)
+if os.path.exists(".env"):
+    load_dotenv()
+
+# Get API key from environment variables (works for both local and Hugging Face Spaces)
+api_key = os.getenv('ANTHROPIC_API_KEY')
+if not api_key:
+    st.error("Please set your ANTHROPIC_API_KEY in the environment variables or .env file")
+    st.stop()
 
 # Configure page
 st.set_page_config(
@@ -14,11 +21,6 @@ st.set_page_config(
 )
 
 # Initialize Anthropic client
-api_key = os.getenv('ANTHROPIC_API_KEY')
-if not api_key:
-    st.error("Please set your ANTHROPIC_API_KEY in the .env file")
-    st.stop()
-
 c = Anthropic(
     api_key=api_key,
 )