release: v1.8.1

feat(ui): unified AnalysisCard for thinking + tool calls

docs: add Working on Multiple Features guide to CONTRIBUTING.md

fix(ui): truly fix tool chain collapse + update label

fix(ui): tool chain grouping, collapse stability, and label polish

fix(ui): restore tool call chain grouping in AgentDetail live chat

fix(feishu): replace divider block_type 22 with text separator; remove index:-1 from doc append

fix(feishu): remove stale import of app.api.websocket_chat in feishu_doc_create

feat(ui): tool call chain pulse LED + active tool name in collapsed state

fix: consume ?token= on app bootstrap for cross-domain tenant switch

fix(ui): remove emoji from Import Presets heading (no-emoji policy)

fix(chat): tighten session access and polish admin chat UI (#286)

feat(ui): optimistic delete for relationship list

fix: prevent duplicate OrgMember shell creation for channel users

fix(security): platform_admin scoped to tenant_id in token when searching org members