Enhances UI with bufferline, diagnostics, and theme

- Integrates plugins for improved buffer management (bufferline, bufdelete) and diagnostics display (trouble).
- Applies the Catppuccin theme for a refreshed visual experience.
- Updates Neovim settings to support new UI elements and enable Nerd Fonts.

lua/custom/plugins/bufferline.lua

@@ -0,0 +1,87 @@
+-- filepath: /home/kali/.config/nvim/lua/custom/plugins/bufferline.lua
+-- Bufferline configuration
+-- https://github.com/akinsho/bufferline.nvim
+
+return {
+  'akinsho/bufferline.nvim',
+  version = "*", -- use the latest stable version
+  event = "VeryLazy", -- lazy load for better startup
+  dependencies = {
+    'nvim-tree/nvim-web-devicons', -- for file icons
+  },
+  opts = {
+    options = {
+      -- Themes and appearance
+      indicator = {
+        style = 'icon',
+        icon = '▎',
+      },
+      buffer_close_icon = '󰅖',
+      modified_icon = '●',
+      close_icon = '',
+      left_trunc_marker = '',
+      right_trunc_marker = '',
+      max_name_length = 18,
+      max_prefix_length = 15,
+      truncate_names = true,
+      tab_size = 18,
+      diagnostics = "nvim_lsp", -- Use LSP diagnostics
+      diagnostics_update_in_insert = false,
+      diagnostics_indicator = function(count, level, diagnostics_dict, context)
+        local icon = level:match("error") and " " or " "
+        return " " .. icon .. count
+      end,
+      offsets = {
+        {
+          filetype = "neo-tree",
+          text = "File Explorer",
+          text_align = "center",
+          separator = true
+        }
+      },
+      color_icons = true,
+      show_buffer_icons = true,
+      show_buffer_close_icons = true,
+      show_close_icon = true,
+      show_tab_indicators = true,
+      separator_style = "thin",
+      enforce_regular_tabs = false,
+      always_show_bufferline = true,
+      hover = {
+        enabled = true,
+        delay = 200,
+        reveal = {'close'}
+      },
+    },
+    -- Colorscheme integration
+    highlights = {
+      -- These are automatically integrated with your colorscheme
+    },
+  },
+  config = function(_, opts)
+    require("bufferline").setup(opts)
+    
+    -- Key mappings for navigating between buffers
+    vim.keymap.set('n', '<leader>bp', '<cmd>BufferLinePick<CR>', {noremap = true, desc = "Pick buffer"})
+    vim.keymap.set('n', '<leader>bc', '<cmd>BufferLinePickClose<CR>', {noremap = true, desc = "Pick buffer to close"})
+    vim.keymap.set('n', '<leader>bh', '<cmd>BufferLineCyclePrev<CR>', {noremap = true, desc = "Previous buffer"})
+    vim.keymap.set('n', '<leader>bl', '<cmd>BufferLineCycleNext<CR>', {noremap = true, desc = "Next buffer"})
+    vim.keymap.set('n', '<leader>bH', '<cmd>BufferLineMovePrev<CR>', {noremap = true, desc = "Move buffer left"})
+    vim.keymap.set('n', '<leader>bL', '<cmd>BufferLineMoveNext<CR>', {noremap = true, desc = "Move buffer right"})
+    vim.keymap.set('n', '<leader>b1', '<cmd>BufferLineGoToBuffer 1<CR>', {noremap = true, desc = "Go to buffer 1"})
+    vim.keymap.set('n', '<leader>b2', '<cmd>BufferLineGoToBuffer 2<CR>', {noremap = true, desc = "Go to buffer 2"})
+    vim.keymap.set('n', '<leader>b3', '<cmd>BufferLineGoToBuffer 3<CR>', {noremap = true, desc = "Go to buffer 3"})
+    vim.keymap.set('n', '<leader>b4', '<cmd>BufferLineGoToBuffer 4<CR>', {noremap = true, desc = "Go to buffer 4"})
+    vim.keymap.set('n', '<leader>b5', '<cmd>BufferLineGoToBuffer 5<CR>', {noremap = true, desc = "Go to buffer 5"})
+    vim.keymap.set('n', '<leader>b6', '<cmd>BufferLineGoToBuffer 6<CR>', {noremap = true, desc = "Go to buffer 6"})
+    vim.keymap.set('n', '<leader>b7', '<cmd>BufferLineGoToBuffer 7<CR>', {noremap = true, desc = "Go to buffer 7"})
+    vim.keymap.set('n', '<leader>b8', '<cmd>BufferLineGoToBuffer 8<CR>', {noremap = true, desc = "Go to buffer 8"})
+    vim.keymap.set('n', '<leader>b9', '<cmd>BufferLineGoToBuffer 9<CR>', {noremap = true, desc = "Go to buffer 9"})
+    
+    -- Additional keymaps for Alt+number to switch buffers quickly
+    for i = 1, 9 do
+      vim.keymap.set('n', string.format('<A-%s>', i), string.format('<cmd>BufferLineGoToBuffer %s<CR>', i), 
+        {noremap = true, desc = string.format("Go to buffer %s", i)})
+    end
+  end,
+}