Update config: remove duplicate mini.pairs, add Claude Code, UI tweaks

- Remove duplicate mini.pairs setup in plugin/30_mini.lua
- Add Claude Code integration with AI keybindings
- Enable transparent background in catppuccin theme
- Change winborder from single to rounded
- Remove unused clipboard and window menu settings

plugin/30_mini.lua

@@ -386,19 +386,6 @@ later(function()
   require('mini.pairs').setup({ modes = { command = true } })
 end)
 
--- Autopairs functionality. Insert pair when typing opening character and go over
--- right character if it is already to cursor's right. Also provides mappings for
--- `<CR>` and `<BS>` to perform extra actions when inside pair.
--- Example usage in Insert mode:
--- - `(` - insert "()" and put cursor between them
--- - `)` when there is ")" to the right - jump over ")" without inserting new one
--- - `<C-v>(` - always insert a single "(" literally. This is useful since
---   'mini.pairs' doesn't provide particularly smart behavior, like auto balancing
-later(function()
-  -- Create pairs not only in Insert, but also in Command line mode
-  require('mini.pairs').setup({ modes = { command = true } })
-end)
-
 -- Pick anything with single window layout and fast matching. This is one of
 -- the main usability improvements as it powers a lot of "find things quickly"
 -- workflows.