Better error handling for API key test

app.py

@@ -250,8 +250,11 @@ def test_api_key(api_key_input):
         else:
             return f"Key found but empty after strip. Raw length: {len(raw_key)}"
 
+    # Clean up common issues with key entry
+    key_to_use = key_to_use.strip().strip('"').strip("'")
+
     # Show key info (without revealing the key)
-    key_preview = f"{key_to_use[:7]}...{key_to_use[-4:]}" if len(key_to_use) > 15 else f"(length: {len(key_to_use)})"
+    key_preview = f"{key_to_use[:10]}...{key_to_use[-4:]}" if len(key_to_use) > 20 else f"(length: {len(key_to_use)})"
 
     try:
         client = anthropic.Anthropic(api_key=key_to_use)
@@ -262,10 +265,16 @@ def test_api_key(api_key_input):
             messages=[{"role": "user", "content": "Say 'OK'"}]
         )
         return f"API key valid! ({key_preview})"
-    except anthropic.AuthenticationError:
-        return f"Invalid key ({key_preview}). Check the key in your Anthropic dashboard."
+    except anthropic.AuthenticationError as e:
+        return f"Auth failed ({key_preview}). Key may be invalid or expired. Check console.anthropic.com"
+    except anthropic.APIConnectionError as e:
+        return f"Connection error: Cannot reach Anthropic API. Check network."
+    except anthropic.RateLimitError as e:
+        return f"Rate limited. Key works but you've hit usage limits."
+    except anthropic.APIStatusError as e:
+        return f"API error {e.status_code}: {e.message}"
     except Exception as e:
-        return f"Error: {str(e)}"
+        return f"Error ({type(e).__name__}): {str(e)}"
 
 
 # Build the interface