Improve session error handling and display

Author: charlesvien

apps/twig/src/renderer/features/sessions/components/SessionView.tsx

@@ -379,15 +379,14 @@ export function SessionView({
                   className="absolute inset-0 bg-gray-1"
                 >
                   <Warning size={32} weight="duotone" color="var(--red-9)" />
-                  <Text size="3" weight="medium" color="red">
-                    Session Error
-                  </Text>
                   <Text
-                    size="2"
+                    size="3"
+                    weight="medium"
                     align="center"
-                    className="max-w-md px-4 text-gray-11"
+                    color="red"
+                    className="max-w-md px-4"
                   >
-                    {errorMessage}
+                    {errorMessage || DEFAULT_ERROR_MESSAGE}
                   </Text>
                   <Flex gap="2" mt="2">
                     {onRetry && (