Fix old task deletion bug

[GitlyHallows]

Context

#1295

The core issues are:

1. Tasks silently disappear when clicked if their files are missing
2. Task history persists in global state even when task files are gone after uninstall/reinstall

Observations:

• The current code in getTaskWithId() silently deletes tasks when files are missing
• There's no validation of task history on extension activation
• No user feedback when task files are missing

Implementation

1. Added task history validation on extension activation to check for missing files
2. Modified getTaskWithId() to throw a specific error instead of silently deleting
3. Updated showTaskWithId() to handle missing files gracefully with user feedback
4. Added Unit tests to verify the new behaviour.

This approach:

• Maintains existing functionality while adding proper error handling
• Provides clear user feedback
• Validates task history on startup to prevent confusion
• Doesn't require clearing history on install (which could be frustrating for users upgrading)

The solution maintains existing functionality while adding proper error handling and user feedback. It doesn't automatically clear history on install/uninstall since that could be frustrating for users who are just upgrading the extension.

Video

Task_history.mov

How to Test

1. Remove or rename a task's API conversation history file(api_conversation_history.json) from its directory
2. Try deleting the task from Roo
3. You should see a warning and an option to remove/keep it in the task history

---

Important

Fixes task history management by validating tasks with missing files on startup and providing user feedback in ClineProvider.ts.

• Behavior:
  • Validates task history on extension activation in extension.ts to remove tasks with missing files.
  • getTaskWithId() in ClineProvider.ts now throws "TASK_FILES_MISSING" error instead of deleting tasks silently.
  • showTaskWithId() in ClineProvider.ts prompts user to remove or keep tasks with missing files.
• Tests:
  • Added tests in ClineProvider.test.ts to verify task history validation and user prompts for missing files.
• Misc:
  • Minor logging changes in extension.ts for task history validation errors.

^{This description was created by for 2a2e467. It will automatically update as commits are pushed.}

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[cte]

Thanks! This is working well for me and is a less confusing experience.

[mrubens]

I think this has some issues when developing in WSL: #1829. Going to revert for now while we investigate since the impact is high on affected users.