Improve subtasks UI

[mrubens]

Important

Improves subtask UI in ChatRow.tsx with enhanced styling and localization updates for better clarity and consistency across languages.

• UI Enhancements:
  • Updated ChatRow.tsx to improve subtask display with new styles and icons for subtask creation and completion.
  • Added subtask_result handling in ChatRow.tsx to display subtask results with specific styling.
• Localization:
  • Updated localization files (chat.json) for multiple languages to include new subtask-related strings like newTaskContent, completionContent, and resultContent.
• Code Changes:
  • Changed resumePausedTask() and finishSubTask() in Cline.ts and ClineProvider.ts to require lastMessage parameter.
  • Modified attemptCompletionTool.ts to handle empty lastMessage gracefully.

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Latest commit: 9fc95db

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