Build exchange workspace and shared transaction services (#28)

frontend/packages/sxchnge_analytics/lib/sxchnge_analytics.dart

@@ -2,7 +2,7 @@ import 'dart:async';
 import 'dart:collection';
 import 'dart:math';
 
-enum JourneyKind { login, signup, verification, kyc }
+enum JourneyKind { login, signup, verification, kyc, topUp, exchange, payout }
 
 enum JourneyStep {
   login,
@@ -14,6 +14,10 @@ enum JourneyStep {
   kycSelfie,
   kycSubmission,
   kycStatus,
+  transferDraft,
+  transferQuote,
+  transferSubmission,
+  settlement,
 }
 
 enum JourneySignal {
@@ -27,6 +31,9 @@ enum JourneySignal {
 }
 
 enum JourneyFailure {
+  insufficientFunds,
+  limitExceeded,
+  declined,
   document,
   invalidCredentials,
   emailInUse,
@@ -79,7 +86,13 @@ class AnalyticsEvent {
   final bool simulated;
   final DateTime occurredAt;
   String get name {
-    final area = kind == JourneyKind.kyc ? 'kyc' : 'auth';
+    final area = switch (kind) {
+      JourneyKind.kyc => 'kyc',
+      JourneyKind.topUp => 'top_up',
+      JourneyKind.exchange => 'exchange',
+      JourneyKind.payout => 'payout',
+      _ => 'auth',
+    };
     var stage = step == null ? 'journey' : _snake(step!.name);
     if (kind == JourneyKind.kyc) stage = stage.replaceFirst('kyc_', '');
     return '${area}_${stage}_${signal.name}';
@@ -189,7 +202,7 @@ class JourneyRecorder {
     operation._finished = true;
     journey.pending--;
     journey.simulated |= simulated;
-    final complete = failure == null && !cancelled && terminal;
+    final complete = !cancelled && terminal;
     _emit(
       journey,
       cancelled
@@ -257,8 +270,8 @@ class JourneyRecorder {
     );
   }
 
-  void dispose() {
-    abandon(JourneyExit.disposed);
+  void dispose({bool abandonActive = true}) {
+    if (abandonActive) abandon(JourneyExit.disposed);
     _disposed = true;
     _idle?.cancel();
   }