Fix subagent bar current-turn scope

[dix105]

Summary

• scope the floating subagent composer bar to the latest/current user turn instead of session-global spawned subagents
• extract subagent turn-scope derivation into a tested helper
• keep Activity/history session-global while documenting the remaining anchor-field fallback edge case

Verification

• pnpm --filter ui test subagentTurnScope --run
• pnpm --filter ui typecheck
• pnpm --filter ui exec eslint components/ChatView/index.tsx lib/subagentTurnScope.ts lib/tests/subagentTurnScope.test.ts (passes with existing warnings in ChatView)
• pnpm --filter ui build
• web UI check against multi-turn subagent chat: latest floating bar showed current turn count (5 background agent) while older historical subagents stayed in transcript/context

Notes

Full repo lint still fails on pre-existing unrelated errors in ChatSearch, ToolCallSteps, ActivityNodes, ChatsSection, useAgentActivity, useSubagentMessages, and localFirstSync tests.

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1 Skipped Deployment

Project	Deployment	Actions	Updated (UTC)
openclaw-desktop-ui	Ignored	Preview	May 26, 2026 7:10pm