Display used and reserved limits capacity

frontend/packages/sxchnge_kyc/README.md

@@ -36,3 +36,8 @@ Photo selection uses Flutter's [file_selector](https://pub.dev/packages/file_sel
 and [image metadata decoding](https://pub.dev/documentation/image/latest/image/Decoder-class.html).
 For native macOS consumers enable the user-selected read-only file entitlement;
 iOS/Android camera permissions are not required for this file-picker-only flow.
+
+Visible limit rows also expose `usedMinor` (committed activity) and `reservedMinor`
+(pending holds). `remainingMinor` is independently provided by the backend and
+must not be inferred as cap minus those fields. The display-only occupied ratio
+includes used plus reserved and is bounded for progress rendering.