feat(ui): add bufferline plugin config

lua/custom/plugins/bufferline.lua

@@ -0,0 +1,18 @@
+return {
+  'akinsho/bufferline.nvim',
+  event = 'VeryLazy',
+  dependencies = { 'nvim-tree/nvim-web-devicons' },
+  keys = {
+    { '<S-h>', '<cmd>BufferLineCyclePrev<CR>', desc = 'Previous buffer' },
+    { '<S-l>', '<cmd>BufferLineCycleNext<CR>', desc = 'Next buffer' },
+    { '<leader>bp', '<cmd>BufferLinePick<CR>', desc = '[B]uffer [P]ick' },
+  },
+  opts = {
+    options = {
+      mode = 'buffers',
+      always_show_bufferline = true,
+      show_buffer_close_icons = false,
+      show_close_icon = false,
+    },
+  },
+}