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.

init.lua

@@ -91,7 +91,7 @@ vim.g.mapleader = ' '
 vim.g.maplocalleader = ' '
 
 -- Set to true if you have a Nerd Font installed and selected in the terminal
-vim.g.have_nerd_font = false
+vim.g.have_nerd_font = true
 
 -- [[ Setting options ]]
 -- See `:help vim.o`
@@ -123,6 +123,12 @@ vim.o.mouse = 'a'
 -- Don't show the mode, since it's already in the status line
 vim.o.showmode = false
 
+-- Hide the command line when not in use
+vim.o.cmdheight = 1
+
+-- Hide the default tab line since we're using bufferline
+vim.o.showtabline = 0
+
 -- Sync clipboard between OS and Neovim.
 --  Schedule the setting after `UiEnter` because it can increase startup-time.
 --  Remove this option if you want your OS clipboard to remain independent.
@@ -362,6 +368,7 @@ require('lazy').setup({
         { '<leader>s', group = '[S]earch' },
         { '<leader>t', group = '[T]oggle' },
         { '<leader>h', group = 'Git [H]unk', mode = { 'n', 'v' } },
+        { '<leader>b', group = '[B]uffer' },
       },
     },
   },