fix: return full item set on ( trigger to survive auto-close

When LazyVim auto-close inserts () after (, nvim-cmp sees ) as the
last character and may suppress the popup. By returning variables,
builtins, and data types alongside the function params, the response
is rich enough that the next keystroke (e.g. typing I after auto-close)
triggers a fresh TextChanged completion that re-detects the call
context via get_call_context in the else branch.

src/main.lua

@@ -920,17 +920,31 @@ function handlers.textDocument_completion(params)
 			local params = call_name and resolve_call_params(call_name, doc.variables, doc.types)
 			if params then
 				add_param_items(items, params, "")
-			elseif doc.functions then
+			end
-				for _, func in ipairs(doc.functions) do
+
+			-- Also add variables and builtins so completion popup stays rich
+			-- even if auto-close ( or client-side filtering interferes
+			if doc.variables then
+				for name, info in pairs(doc.variables) do
 					table.insert(items, {
-						label = func.name,
+						label = "#" .. name,
-						kind = 3,
+						filterText = "#" .. name,
-						detail = func.kind:upper(),
+						kind = 13,
-						insertText = func.name .. "()",
+						detail = "Variable (" .. (info.type or "VAR") .. "): " .. (info.data_type or "unknown"),
-						insertTextFormat = 2,
+						insertText = "#" .. name,
+						insertTextFormat = 1,
 					})
 				end
 			end
+			for type_name, _ in pairs(builtin.DATA_TYPES) do
+				table.insert(items, { label = type_name, kind = 7, detail = "Data type", insertText = type_name, insertTextFormat = 1 })
+			end
+			for fb_name, _ in pairs(builtin.FUNCTION_BLOCKS) do
+				table.insert(items, { label = fb_name, kind = 6, detail = "Function block", insertText = fb_name, insertTextFormat = 1 })
+			end
+			for func_name, _ in pairs(builtin.FUNCTIONS) do
+				table.insert(items, { label = func_name, kind = 3, detail = "Function", insertText = func_name, insertTextFormat = 1 })
+			end
 		else
 			-- Check if we're inside a function call (e.g., after instTestTimer()
 			local call_name = get_call_context(line, col)