Add E2EE unit tests and improve mobile UI

- Add comprehensive tests for encryption/decryption logic
- Improve error messages for encrypted chat
- Update profile danger zone UI with blur effect
- Refactor typing indicator hook

apps/mobile/src/components/feedback/QuestionFeedbackModal.tsx

@@ -303,12 +303,12 @@ const styles = StyleSheet.create({
     },
     cancelButton: {
         flex: 1,
-        backgroundColor: colors.glass.background,
+        backgroundColor: colors.glass.backgroundLight,
         paddingVertical: spacing.md,
         borderRadius: radius.md,
         alignItems: 'center',
         borderWidth: 1,
-        borderColor: colors.glass.border,
+        borderColor: colors.glass.borderLight,
     },
     cancelButtonText: {
         ...typography.body,