feat(chats): add archive and delete actions

[LittleChenLiya]

问题原因

Issue #3027 需要对历史对话提供清理能力；但直接删除会让对话彻底消失，不适合只想隐藏但保留记录的用户。

修改内容

• 新增对话归档能力，默认历史列表不显示已归档对话。
• 左侧最近对话菜单只保留归档入口，避免在侧边栏误删。
• 对话管理页支持归档/已归档视图、复选多选、全选、Shift 范围选择，以及批量归档/恢复/删除。
• 批量删除前增加确认弹窗，删除后对话彻底移除。

Closes #3027

Problem Cause

Issue #3027 asks for a way to clean up chat history. Direct deletion permanently removes a chat, which does not fit users who only want to hide a chat while keeping it available later.

Changes

• Add chat archive support, with archived chats hidden from the default history list.
• Keep only Archive in the left recent-chat menu to avoid accidental deletion from the sidebar.
• Add active/archived views, checkbox multi-select, Select all, Shift range selection, and batch archive/restore/delete on the chats management page.
• Add a confirmation dialog before batch deletion, after which selected chats are permanently removed.

[Copilot]

Pull request overview

Note

Copilot was unable to run its full agentic suite in this review.

Adds end-to-end thread deletion support from the chats list, and extends backend thread deletion to clean up associated persisted data (runs, events, feedback) with stronger failure signaling when thread metadata deletion fails.

Changes:

• Frontend: add a delete action to the chats list UI and update E2E mocks/tests to support deleting threads.
• Frontend hook: adjust useDeleteThread to conditionally call the LangGraph delete endpoint based on env.
• Backend: on thread delete, also delete run events / feedback / runs by thread, and add repositories/store APIs + tests for delete_by_thread.

Reviewed changes

Copilot reviewed 17 out of 17 changed files in this pull request and generated 6 comments.

Show a summary per file

File	Description
frontend/tests/e2e/utils/mock-api.ts	Adds mock route for backend thread deletion and makes mock threads mutable.
frontend/tests/e2e/thread-history.spec.ts	Adds E2E coverage for deleting a thread from the chats list page.
frontend/src/core/threads/hooks.ts	Updates delete mutation to optionally call LangGraph delete depending on env.
frontend/src/app/workspace/chats/page.tsx	Adds “More” menu + Delete action per thread row (non-static mode).
backend/tests/test_threads_router.py	Adds tests asserting run/feedback/run_store cleanup and 500 on meta-delete failure.
backend/tests/test_run_repository.py	Adds delete_by_thread tests for SQL run repository.
backend/tests/test_persistence_scaffold.py	Adds scaffold tests for delete_by_thread across stores.
backend/tests/test_feedback.py	Adds delete_by_thread tests for SQL feedback repository.
backend/tests/_router_auth_helpers.py	Extends auth test helper to include thread_store.delete AsyncMock.
backend/packages/harness/deerflow/runtime/runs/store/memory.py	Implements in-memory delete_by_thread for runs.
backend/packages/harness/deerflow/runtime/runs/store/base.py	Adds abstract delete_by_thread contract for runs store.
backend/packages/harness/deerflow/runtime/events/store/memory.py	Extends event store delete APIs to accept user_id kwarg.
backend/packages/harness/deerflow/runtime/events/store/jsonl.py	Extends JSONL event store delete APIs to accept user_id kwarg.
backend/packages/harness/deerflow/runtime/events/store/base.py	Updates abstract method signatures to include optional user_id.
backend/packages/harness/deerflow/persistence/run/sql.py	Implements SQL delete_by_thread for runs with optional owner filter.
backend/packages/harness/deerflow/persistence/feedback/sql.py	Implements SQL delete_by_thread for feedback with optional owner filter.
backend/app/gateway/routers/threads.py	Deletes events/feedback/runs by thread; makes thread metadata delete a hard failure (500).

[Copilot]

Pull request overview

Copilot reviewed 21 out of 21 changed files in this pull request and generated 6 comments.

[Copilot]

Pull request overview

Copilot reviewed 21 out of 21 changed files in this pull request and generated 4 comments.

[Copilot]

Pull request overview

Copilot reviewed 22 out of 22 changed files in this pull request and generated 7 comments.