feat(tss): add real-time round progress from msg.Type() parsing

Extract current round number from tss-lib message type string using
regex pattern `Round(\d+)`. This enables real-time progress updates
(1/4, 2/4... for keygen, 1/9, 2/9... for signing) instead of only
showing completion status.

Changes across all three platforms:
- tss-wasm/main.go: Add extractRoundFromMessageType() and call
  OnProgress with parsed round on each outgoing message
- service-party-android/tsslib/tsslib.go: Same implementation for
  Android gomobile binding
- service-party-app/tss-party/main.go: Same implementation for
  Electron subprocess, with isKeygen parameter to distinguish
  keygen (4 rounds) vs signing (9 rounds)

Safe fallback: Returns 0 if parsing fails, which doesn't affect
protocol execution - only UI display.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

backend/mpc-system/services/service-party-android/tsslib/tsslib.go

@@ -11,6 +11,8 @@ import (
 	"encoding/json"
 	"fmt"
 	"math/big"
+	"regexp"
+	"strconv"
 	"sync"
 	"time"
 
@@ -20,6 +22,11 @@ import (
 	"github.com/bnb-chain/tss-lib/v2/tss"
 )
 
+// Regex to extract round number from tss-lib message type
+// Message types look like: "binance.tsslib.ecdsa.keygen.KGRound1Message"
+// or "binance.tsslib.ecdsa.signing.SignRound3Message"
+var roundRegex = regexp.MustCompile(`Round(\d+)`)
+
 // MessageCallback is the interface for receiving TSS protocol messages
 // Android side implements this interface to handle message routing
 type MessageCallback interface {
@@ -531,6 +538,19 @@ func CancelSession() {
 	}
 }
 
+// extractRoundFromMessageType parses the round number from a tss-lib message type string.
+// Returns 0 if parsing fails (safe fallback).
+// Example: "binance.tsslib.ecdsa.keygen.KGRound2Message1" -> 2
+func extractRoundFromMessageType(msgType string) int {
+	matches := roundRegex.FindStringSubmatch(msgType)
+	if len(matches) >= 2 {
+		if round, err := strconv.Atoi(matches[1]); err == nil {
+			return round
+		}
+	}
+	return 0 // Safe fallback - doesn't affect protocol, just shows 0 in UI
+}
+
 func (s *tssSession) handleOutgoingMessage(msg tss.Message) {
 	msgBytes, _, err := msg.WireBytes()
 	if err != nil {
@@ -558,6 +578,14 @@ func (s *tssSession) handleOutgoingMessage(msg tss.Message) {
 
 	data, _ := json.Marshal(outMsg)
 	s.callback.OnOutgoingMessage(string(data))
+
+	// Extract current round from message type and send progress update
+	totalRounds := 4 // GG20 keygen has 4 rounds
+	if !s.isKeygen {
+		totalRounds = 9 // GG20 signing has 9 rounds
+	}
+	currentRound := extractRoundFromMessageType(msg.Type())
+	s.callback.OnProgress(currentRound, totalRounds)
 }
 
 func isDuplicateError(err error) bool {

backend/mpc-system/services/service-party-app/tss-party/main.go

@@ -15,6 +15,8 @@ import (
 	"math/big"
 	"os"
 	"os/signal"
+	"regexp"
+	"strconv"
 	"sync"
 	"syscall"
 	"time"
@@ -25,6 +27,11 @@ import (
 	"github.com/bnb-chain/tss-lib/v2/tss"
 )
 
+// Regex to extract round number from tss-lib message type
+// Message types look like: "binance.tsslib.ecdsa.keygen.KGRound1Message"
+// or "binance.tsslib.ecdsa.signing.SignRound3Message"
+var roundRegex = regexp.MustCompile(`Round(\d+)`)
+
 // Message types for IPC
 type Message struct {
 	Type           string   `json:"type"`
@@ -290,7 +297,7 @@ func executeKeygen(
 				if !ok {
 					return
 				}
-				handleOutgoingMessage(msg)
+				handleOutgoingMessage(msg, true) // isKeygen = true
 			}
 		}
 	}()
@@ -321,7 +328,7 @@ func executeKeygen(
 		}
 	}()
 
-	// Track progress
+	// Track progress (final completion reporting)
 	totalRounds := 4 // GG20 keygen has 4 rounds
 
 	// Wait for completion
@@ -357,7 +364,20 @@ func executeKeygen(
 	}
 }
 
-func handleOutgoingMessage(msg tss.Message) {
+// extractRoundFromMessageType parses the round number from a tss-lib message type string.
+// Returns 0 if parsing fails (safe fallback).
+// Example: "binance.tsslib.ecdsa.keygen.KGRound2Message1" -> 2
+func extractRoundFromMessageType(msgType string) int {
+	matches := roundRegex.FindStringSubmatch(msgType)
+	if len(matches) >= 2 {
+		if round, err := strconv.Atoi(matches[1]); err == nil {
+			return round
+		}
+	}
+	return 0 // Safe fallback - doesn't affect protocol, just shows 0 in UI
+}
+
+func handleOutgoingMessage(msg tss.Message, isKeygen bool) {
 	msgBytes, _, err := msg.WireBytes()
 	if err != nil {
 		return
@@ -379,6 +399,14 @@ func handleOutgoingMessage(msg tss.Message) {
 
 	data, _ := json.Marshal(outMsg)
 	fmt.Println(string(data))
+
+	// Extract current round from message type and send progress update
+	totalRounds := 4 // GG20 keygen has 4 rounds
+	if !isKeygen {
+		totalRounds = 9 // GG20 signing has 9 rounds
+	}
+	currentRound := extractRoundFromMessageType(msg.Type())
+	sendProgress(currentRound, totalRounds)
 }
 
 func handleIncomingMessage(
@@ -682,7 +710,7 @@ func executeSign(
 				if !ok {
 					return
 				}
-				handleOutgoingMessage(msg)
+				handleOutgoingMessage(msg, false) // isKeygen = false (signing)
 			}
 		}
 	}()

backend/mpc-system/services/tss-wasm/main.go

@@ -10,6 +10,8 @@ import (
 	"encoding/json"
 	"fmt"
 	"math/big"
+	"regexp"
+	"strconv"
 	"sync"
 	"syscall/js"
 
@@ -19,6 +21,11 @@ import (
 	"github.com/bnb-chain/tss-lib/v2/tss"
 )
 
+// Regex to extract round number from tss-lib message type
+// Message types look like: "binance.tsslib.ecdsa.keygen.KGRound1Message"
+// or "binance.tsslib.ecdsa.signing.SignRound3Message"
+var roundRegex = regexp.MustCompile(`Round(\d+)`)
+
 // Global state for active sessions
 var (
 	activeSessions = make(map[string]*TSSSession)
@@ -401,6 +408,19 @@ func stopSession(this js.Value, args []js.Value) interface{} {
 	return createSuccessResult(nil)
 }
 
+// extractRoundFromMessageType parses the round number from a tss-lib message type string.
+// Returns 0 if parsing fails (safe fallback).
+// Example: "binance.tsslib.ecdsa.keygen.KGRound2Message1" -> 2
+func extractRoundFromMessageType(msgType string) int {
+	matches := roundRegex.FindStringSubmatch(msgType)
+	if len(matches) >= 2 {
+		if round, err := strconv.Atoi(matches[1]); err == nil {
+			return round
+		}
+	}
+	return 0 // Safe fallback - doesn't affect protocol, just shows 0 in UI
+}
+
 // handleOutgoingMessages processes messages from the TSS protocol
 func (s *TSSSession) handleOutgoingMessages() {
 	totalRounds := 4 // GG20 keygen has 4 rounds
@@ -440,8 +460,9 @@ func (s *TSSSession) handleOutgoingMessages() {
 			jsMsgJSON, _ := json.Marshal(jsMsg)
 			s.OnMessage.Invoke(string(jsMsgJSON))
 
-			// Send progress update
-			s.OnProgress.Invoke(totalRounds, totalRounds) // Simplified progress
+			// Extract current round from message type and send progress update
+			currentRound := extractRoundFromMessageType(msg.Type())
+			s.OnProgress.Invoke(currentRound, totalRounds)
 		}
 	}
 }