fix: chat issues #625 #662 (b)

[a7m-1st]

Description

1. Mainly fixes [BUG] Multi-turn Task - Task Title failed to generate #625 where summary tasks is generated on each multi turn task
2. Issue [BUG] Task plan Editing doesn't work on multi turn task > 1 #662 (b) is also fixed, where
   a. Random error on "end" is handled in chat_service
   b. Enhance error such as chatStore is updated & workforce is stopped.
   c. When "end project", delete the task from history instead as not to display "half done task" on replay.

Wishes

1. On end project, the task is the current task id. So do take note when refocusing "Active ChatStore".
2. If I were to focus on enhancing the end project would be to handle:
   a. When task is running, stop workforce + update all tasks as failed (if not completed). But I need testing on replay ⚠️ which is why it needs a separate PR.
   b. When no task, do nothing

• Bug fix
• New Feature
• Documentation update
• Other