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/catppuccin.lua

@@ -0,0 +1,80 @@
+-- In your plugins configuration file (e.g., lua/plugins/catppuccin.lua or similar)
+return {
+  {
+    'catppuccin/nvim',
+    name = 'catppuccin', -- Optional, but can be useful for referring to the plugin
+    priority = 1000, -- Ensure it loads early to apply the colorscheme
+    lazy = false, -- Load on startup if you want it as your default theme
+    config = function()
+      -- Load the colorscheme here
+      -- vim.cmd.colorscheme "catppuccin" -- Default is "mocha" if no flavour is specified
+
+      -- Or, to specify a flavour and set up integrations:
+      require('catppuccin').setup {
+        flavour = 'mocha', -- latte, frappe, macchiato, mocha
+        background = { -- :h background
+          light = 'latte',
+          dark = 'mocha',
+        },
+        transparent_background = false, -- useful if you want the underlying terminal colors to show through
+        show_end_of_buffer = false, -- shows the '~' characters after the end of buffers
+        term_colors = true, -- Toggles Neovim terminal colors for the Catppuccin palette.
+        dim_inactive = {
+          enabled = false, -- dims inactive windows
+          shade = 'dark',
+          percentage = 0.15,
+        },
+        no_italic = false, -- Force no italic
+        no_bold = false, -- Force no bold
+        no_underline = false, -- Force no underline
+        styles = { -- Handles the styles of general hi groups (see `:h highlight-args`):
+          comments = { 'italic' },
+          conditionals = { 'italic' },
+          loops = {},
+          functions = {},
+          keywords = {},
+          strings = {},
+          variables = {},
+          numbers = {},
+          booleans = {},
+          properties = {},
+          types = {},
+          operators = {},
+          -- miscs = {}, -- Custom groups for miscellaneous items specific to firmware development
+        },
+        color_overrides = {},
+        custom_highlights = {},
+        integrations = {
+          cmp = true,
+          gitsigns = true,
+          nvimtree = true,
+          telescope = true,
+          notify = true,
+          mini = {
+            enabled = true,
+            indentscope_color = '',
+          },
+          -- For more plugins integrations please check integration table in the README project
+          native_lsp = {
+            enabled = true,
+            underlines = {
+              errors = { 'undercurl' },
+              hints = { 'undercurl' },
+              warnings = { 'undercurl' },
+              information = { 'undercurl' },
+            },
+          },
+          headlines = true,
+          indent_blankline = {
+            enabled = true,
+            scope_color = 'mauve', -- catppuccin color a available flavor
+            -- Also a vailable: latte, frappe, macchiato, mocha
+          },
+        },
+      }
+
+      -- After setting up, set the colorscheme
+      vim.cmd.colorscheme 'catppuccin'
+    end,
+  },
+}