Fix: Exit insert mode and cleanup buffers when closing picker

[0xDAEF0F]

Summary

This PR fixes three related issues with the file picker:

• Files opening in insert mode instead of normal mode when selected
• User remaining in insert mode when closing picker without selecting a file
• E37 error when quitting Vim after using the picker

Changes

1. Added vim.cmd('stopinsert') in the select function before closing the picker
2. Added vim.cmd('stopinsert') at the beginning of the close function
3. Added proper buffer cleanup in the close function to delete all created buffers

Testing

• Open the picker with <C-p>
• Select a file - it now opens in normal mode ✓
• Open the picker again and press <Esc> - you return to normal mode ✓
• Open the picker and close it, then try :q\! - no E37 error ✓

Fixes #8

[dmtrKovalenko]

Thank you so much for a contribution. Changes make a lot of sense!

[dmtrKovalenko]

Could you quickly run stylua? I’d love to merge it just not near the computer rn

[dmtrKovalenko]

It’s hard for me rn because I know that this unlocks certain flows but I really need to test the solution. I’m just thinking won’t it cause much more significant load time?

probably I’ll merge it rn even with CI failures to unfuck the current state of things and will revisit it tonight.

Same for ci

[0xDAEF0F]

anytime bro thank you for creating this!