feat(co-sign): add debug logs for auto-join flow in CoSignJoin

Add console.log statements to trace the auto-join logic:
- Log loaded shares with sessionId
- Log auto-select share matching check
- Log auto-join conditions and share match status
- Log validateInviteCode results including joinToken
- Log handleJoinSession parameters

🤖 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-app/src/pages/CoSignJoin.tsx

@@ -51,6 +51,11 @@ export default function CoSignJoin() {
         const result = await window.electronAPI.storage.listShares();
         // 兼容不同返回格式
         const shareList = Array.isArray(result) ? result : ((result as any)?.data || []);
+        console.log('[CoSignJoin] Loaded shares:', shareList.map((s: Share) => ({
+          id: s.id,
+          sessionId: s.sessionId,
+          walletName: s.walletName,
+        })));
         setShares(shareList);
       } catch (err) {
         console.error('Failed to load shares:', err);
@@ -71,17 +76,36 @@ export default function CoSignJoin() {
     if (sessionInfo && shares.length > 0 && !selectedShareId) {
       // 尝试找到匹配的 share（基于 keygen session ID）
       const matchingShare = shares.find(s => s.sessionId === sessionInfo.keygenSessionId);
+      console.log('[CoSignJoin] Auto-select share check:', {
+        keygenSessionId: sessionInfo.keygenSessionId,
+        sharesSessionIds: shares.map(s => s.sessionId),
+        matchingShare: matchingShare ? { id: matchingShare.id, sessionId: matchingShare.sessionId } : null,
+      });
       if (matchingShare) {
+        console.log('[CoSignJoin] Auto-selecting matching share:', matchingShare.id);
         setSelectedShareId(matchingShare.id);
       } else if (shares.length === 1) {
         // 如果只有一个 share，自动选择
+        console.log('[CoSignJoin] Auto-selecting only share:', shares[0].id);
         setSelectedShareId(shares[0].id);
+      } else {
+        console.log('[CoSignJoin] No matching share found, user must select manually');
       }
     }
   }, [sessionInfo, shares, selectedShareId]);
 
   // 自动加入
   useEffect(() => {
+    console.log('[CoSignJoin] Auto-join check:', {
+      step,
+      hasSessionInfo: !!sessionInfo,
+      hasJoinToken: !!joinToken,
+      selectedShareId,
+      autoJoinAttempted,
+      isLoading,
+      sharesCount: shares.length,
+    });
+
     if (
       step === 'select_share' &&
       sessionInfo &&
@@ -92,14 +116,24 @@ export default function CoSignJoin() {
     ) {
       // 找到匹配的 share 且未尝试过自动加入，则自动加入
       const matchingShare = shares.find(s => s.sessionId === sessionInfo.keygenSessionId);
+      console.log('[CoSignJoin] Auto-join conditions met, checking share match:', {
+        keygenSessionId: sessionInfo.keygenSessionId,
+        matchingShareId: matchingShare?.id,
+        selectedShareId,
+        isMatch: matchingShare && matchingShare.id === selectedShareId,
+      });
       if (matchingShare && matchingShare.id === selectedShareId) {
+        console.log('[CoSignJoin] Auto-joining session...');
         setAutoJoinAttempted(true);
         handleJoinSession();
+      } else {
+        console.log('[CoSignJoin] Share mismatch, not auto-joining');
       }
     }
   }, [step, sessionInfo, joinToken, selectedShareId, autoJoinAttempted, isLoading, shares]);
 
   const handleValidateCode = async (codeToValidate: string) => {
+    console.log('[CoSignJoin] handleValidateCode called:', codeToValidate);
     if (!codeToValidate.trim()) {
       setError('请输入邀请码');
       return;
@@ -110,16 +144,26 @@ export default function CoSignJoin() {
 
     try {
       const result: ValidateResult = await window.electronAPI.cosign.validateInviteCode(codeToValidate);
+      console.log('[CoSignJoin] validateInviteCode result:', {
+        success: result.success,
+        sessionInfo: result.sessionInfo,
+        hasJoinToken: !!result.joinToken,
+        joinTokenPreview: result.joinToken?.substring(0, 20) + '...',
+        error: result.error,
+      });
       if (result.success && result.sessionInfo) {
         setSessionInfo(result.sessionInfo);
         if (result.joinToken) {
           setJoinToken(result.joinToken);
+        } else {
+          console.warn('[CoSignJoin] WARNING: No joinToken in response!');
         }
         setStep('select_share');
       } else {
         setError(result.error || '无效的邀请码');
       }
     } catch (err) {
+      console.error('[CoSignJoin] validateInviteCode error:', err);
       setError('验证邀请码失败，请检查网络连接');
     } finally {
       setIsLoading(false);
@@ -127,6 +171,12 @@ export default function CoSignJoin() {
   };
 
   const handleJoinSession = async () => {
+    console.log('[CoSignJoin] handleJoinSession called:', {
+      hasSessionInfo: !!sessionInfo,
+      hasJoinToken: !!joinToken,
+      selectedShareId,
+    });
+
     if (!sessionInfo) {
       setError('会话信息不完整');
       return;
@@ -146,6 +196,14 @@ export default function CoSignJoin() {
     setIsLoading(true);
     setError(null);
 
+    console.log('[CoSignJoin] Calling cosign.joinSession with:', {
+      sessionId: sessionInfo.sessionId,
+      shareId: selectedShareId,
+      walletName: sessionInfo.walletName,
+      messageHash: sessionInfo.messageHash,
+      threshold: sessionInfo.threshold,
+    });
+
     try {
       const result = await window.electronAPI.cosign.joinSession({
         sessionId: sessionInfo.sessionId,
@@ -156,6 +214,7 @@ export default function CoSignJoin() {
         messageHash: sessionInfo.messageHash,
         threshold: sessionInfo.threshold,
       });
+      console.log('[CoSignJoin] joinSession result:', result);
 
       if (result.success) {
         navigate(`/cosign/session/${sessionInfo.sessionId}`);