review fixes: version bump, keyword check, warning assertion

Fixes from subagent review:
- ASDF version 0.3.0 → 0.4.0
- define-preset now checks (check-type name keyword) at macro-expand time
- load-preset-unknown-warns test now uses (signals warning ...) to
  actually verify the warning fires (was false-positive before)

cl-tui.asd

@@ -2,7 +2,7 @@
 (asdf:defsystem :cl-tui
   :description "Reusable Common Lisp Terminal UI Framework"
   :author "Amr Gharbeia"
-  :version "0.3.0"
+  :version "0.4.0"
   :license "TBD"
   :depends-on (:fiveam)
   :components

src/components/theme-tests.lisp

@@ -48,7 +48,7 @@
 (test load-preset-unknown-warns
   "Unknown preset warns but doesn't error"
   (let ((th (make-theme)))
-    (load-preset th :nonexistent)
+    (signals warning (load-preset th :nonexistent))
     (is (null (theme-color th :primary)))))
 
 (test preset-switch-mode

src/components/theme.lisp

@@ -22,6 +22,7 @@
 (defmacro define-preset (name &key dark light)
   "Define a theme preset with DARK and LIGHT variants.
 NAME should be a keyword (e.g., :default, :nord)."
+  (check-type name keyword)
   `(setf (gethash ,name *presets*) '(:dark ,dark :light ,light)))
 
 (defun load-preset (theme preset-name)