fix(ui): guard against nil colors_name in lualine/bufferline

vim.g.colors_name is nil until a colorscheme is applied, so calling
:find() on it directly could error if these modules load before any
:colorscheme. Coalesce to an empty string, matching the safe pattern
already used in modules/utils/init.lua.

Author: charliie-dev

lua/modules/configs/ui/bufferline.lua

@@ -40,7 +40,7 @@ return function()
 		highlights = {},
 	}
 
-	if vim.g.colors_name:find("catppuccin") then
+	if (vim.g.colors_name or ""):find("catppuccin") then
 		local cp = require("modules.utils").get_palette() -- Get the palette.
 
 		local catppuccin_hl_overwrite = {

lua/modules/configs/ui/lualine.lua

@@ -41,7 +41,7 @@ vim.api.nvim_create_autocmd("LspProgress", {
 })
 
 return function()
-	local has_catppuccin = vim.g.colors_name:find("catppuccin") ~= nil
+	local has_catppuccin = (vim.g.colors_name or ""):find("catppuccin") ~= nil
 	local colors = require("modules.utils").get_palette()
 	local icons = {
 		diagnostics = require("modules.utils.icons").get("diagnostics", true),
@@ -57,7 +57,7 @@ return function()
 			group = vim.api.nvim_create_augroup("LualineColorScheme", { clear = true }),
 			pattern = "*",
 			callback = function()
-				has_catppuccin = vim.g.colors_name:find("catppuccin") ~= nil
+				has_catppuccin = (vim.g.colors_name or ""):find("catppuccin") ~= nil
 				require("lualine").setup({ options = { theme = custom_theme() } })
 			end,
 		})