fix(nvim): refactor treesitter to explicit parser list with deferred install

nvim/lua/olinpin/plugins/treesitter.lua

@@ -3,7 +3,22 @@ return {
 	lazy = false,
 	build = ':TSUpdate',
 	config = function()
-		-- New nvim-treesitter just installs parsers, Neovim handles highlighting
+		local ensure_installed = {
+			"lua", "vim", "vimdoc", "javascript", "typescript", "tsx",
+			"html", "css", "json", "yaml", "markdown", "bash", "python",
+			"php", "vue", "dockerfile", "go", "rust",
+		}
+
+		-- Auto-install missing parsers
+		vim.defer_fn(function()
+			for _, lang in ipairs(ensure_installed) do
+				local ok = pcall(vim.treesitter.language.inspect, lang)
+				if not ok then
+					vim.cmd("TSInstall " .. lang)
+				end
+			end
+		end, 100)
+
 		-- Start treesitter highlighting for all buffers with a parser
 		vim.api.nvim_create_autocmd("FileType", {
 			callback = function(args)