feat(lua): expand LuaLSP, Treesitter and pack helper configurations

Why: improve language support and fix a client API typo

- New Features
  - Added extensive filetype list for Tailwind LSP (astro, blade, ejs, etc.) and enabled the language server
  - Extended Treesitter parser list with regex, latex, tsx, svelte, typst, vue
  - Introduced PackChanged autocmd that notifies on install/update builds
- Enhancements
  - Disabled unused provider loaders (node, perl, python3, ruby)
  - Registered additional filetype handlers for various template extensions
  - Updated markdown style setting and filledchars option
- Bug Fixes
  - Corrected client:supports_method call in autocmd.lua (removed stray colon)

lua/autocmd.lua

@@ -121,7 +121,7 @@ vim.api.nvim_create_autocmd("LspAttach", {
 	group = augroup("lsp_attach_autocmds"),
 	callback = function(args)
 		local client = vim.lsp.get_client_by_id(args.data.client_id)
-		if client and client.supports_method("textDocument/documentHighlight") then
+		if client and client:supports_method("textDocument/documentHighlight") then
 			vim.api.nvim_create_autocmd({ "CursorHold", "CursorHoldI" }, {
 				buffer = args.buf,
 				callback = vim.lsp.buf.document_highlight,