add bigfiles.nvim plugin to stop slowdown from hive integration

lua/plugins/big_files.lua

@@ -0,0 +1,20 @@
+return {
+	{
+		"LunarVim/bigfile.nvim",
+		event = { "BufReadPre", "BufNewFile" },
+		opts = {
+			filesize = 0.01,                          -- 10 KiB (your hive_adapters.g.dart sits right around here)
+			pattern = { "*.g.dart", "hive_registrar.g.dart" }, -- Force override on generated Dart files
+			features = {
+				"indent_blankline",                   -- Disables heavy indentation lines
+				"lsp",                                -- Strips LSP diagnostics and semantic tokens for this buffer
+				"treesitter",                         -- Completely disables treesitter parsing/highlighting
+				"syntax",                             -- Drops standard heavy syntax engines
+				"matchparen",                         -- Stops Neovim from trying to match deeply nested brackets
+			},
+		},
+		config = function(_, opts)
+			require("bigfile").setup(opts)
+		end,
+	},
+}