This commit implements a three-layer fix to restore the "Sync to other side"
feature when adding or editing MCP servers across Claude and Codex.
Root Cause Analysis:
1. Frontend issue: New MCP entries had their `enabled` field deleted
2. Backend issue: Default value was `false` when `enabled` was missing
3. Core issue: MCP entries were never copied to the other app's servers
Changes:
Frontend (McpFormModal.tsx):
- Set `enabled=true` by default for new MCP entries
- Preserve existing `enabled` state when editing
Backend (services/mcp.rs):
- Change default value from `unwrap_or(false)` to `unwrap_or(true)`
- Implement cross-app MCP replication when `sync_other_side=true`
- Clone MCP entry to other app's servers before syncing to live files
Impact:
- "Sync to Codex" checkbox now correctly adds MCP to both Claude and Codex
- "Sync to Claude" checkbox now correctly adds MCP to both Codex and Claude
- Both config.json and live files (~/.claude.json, ~/.codex/config.toml) are updated
- Fixes regression introduced during project restructure
Tested:
- TypeScript type checking passed
- Rust clippy linting passed
- Manual testing: MCP sync works bidirectionally