checkApiKeys function
void
checkApiKeys()
Implementation
void checkApiKeys() {
if (aiProvider == 'Gemini' && geminiApiKey.isEmpty) {
throw AssertionError('AI is set to Gemini, but GEMINI_API_KEY is not set. '
'Run the app with --dart-define=GEMINI_API_KEY=YOUR_API_KEY');
} else if (aiProvider == 'Copilot' && (copilotApiKey.isEmpty || copilotEndpoint.isEmpty)) {
throw AssertionError(
'AI is set to Copilot, but COPILOT_API_KEY or COPILOT_ENDPOINT is not set.');
}
}