Persist tool audit panels in chat history

[rogerchappel]

Summary

• group persisted chat progress events by run/tool execution block
• render completed tool audit blocks inline in the chat transcript timeline
• keep the live execution panel only for current/fallback activity instead of replacing historical audit visibility

Verification

• pnpm typecheck
• pnpm test -- src/lib/chat-session-events.test.ts
• git diff --check
• push hook: pnpm typecheck && pnpm build

Notes

• No DB migration needed: this uses existing chat_session_events persisted payloads.
• Audit blocks are grouped by runId when available, then tool/checkpoint id as fallback.
• Build completed with the existing Turbopack NFT tracing warning for next.config.ts -> openclaw-config-parser -> runtimes/probe.