feat(rithmomachia): skip helper selection UI and auto-select first valid helper
When a capture relation is selected that requires a helper piece, automatically select the first valid helper instead of showing the helper selection ring UI. This streamlines the capture flow since we already show all valid helpers with number bond triangles when hovering over relation buttons. Changes: - Auto-select first valid helper in handleCaptureWithRelation - Skip Phase 2 (helper selection UI) by setting both selectedRelation and selectedHelper - User flow: hover relation → see all valid helpers → click relation → capture animation 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com>
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