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/40_plugins.lua

@@ -119,9 +119,13 @@ now_if_args(function()
   add({ source = "catppuccin/nvim", name = "catppuccin" })
   require('catppuccin').setup({
     flavour = 'mocha',
+    transparent_background = true,
     dim_inactive = {
       enabled = true,
     },
+    float = {
+      transparent = true,
+    },
   })
   vim.cmd('colorscheme catppuccin')
 end)
@@ -142,3 +146,13 @@ later(function()
   })
   require('gitsigns').setup({})
 end)
+
+-- claudecode =================================================================
+later(function ()
+  add({
+    source = 'coder/claudecode.nvim',
+    depends = { 'folke/snacks.nvim' },
+  })
+  require('claudecode').setup({})
+end
+)