Add complete co-sign functionality for multi-party transaction signing:
Frontend (React):
- CoSignCreate.tsx: Create signing session with share selection
- CoSignJoin.tsx: Join signing session via invite code
- CoSignSession.tsx: Monitor signing progress and results
- Add routes in App.tsx for new pages
Backend (Electron):
- main.ts: Add IPC handlers for co-sign operations
- tss-handler.ts: Add participateSign() for TSS signing
- preload.ts: Expose cosign API to renderer
- account-client.ts: Add sign session API types
TSS Party (Go):
- main.go: Implement 'sign' command for GG20 signing protocol
- integration_test.go: Add comprehensive tests for signing flow
Infrastructure:
- docker-compose.windows.yml: Expose gRPC port 50051
This is a pure additive change that does not affect existing
persistent role keygen/sign functionality.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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