fix(chat): UX fixes for agentic chat

[laileni-aws]

Problem

• IDE requests permission twice when accessing files outside workspace
  
• Users can see insert at cursor and copy buttons for bash commands.
• UX stying: No borders for
  • Read and List directory files/folder outside of the workspace
  • Code diff view UX
  • Execute bash command UX
• Insert at cursor option is available if pair programming mode is enabled.

Solution

• Fixed issue issue of showing reading files twice.
  
• Fixed issue of showing insert at cursor and copy buttons for bash commands.
• Added borders for mentioned UX.
• User can see only Copy option (remove Insert at cursor option) if pair programming mode is enabled.
  
  
• If user turn off pair programming mode, IDE shows both Insert at cursor and Copy options.
  

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[github-actions]

• This pull request modifies code in src/* but no tests were added/updated.
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