design: 新增七风格探索稿——瑞士/孟菲斯/拼贴/波普/扁平/像素/极简，同构课程卡横向对比

design-refs/mockup/build.sh

@@ -17,7 +17,7 @@ export TMPDIR="$HOME/.cache/h2p-tmp"
 
 STEMS=("$@")
 if [ ${#STEMS[@]} -eq 0 ]; then
-  STEMS=(course-shelf components color-system)
+  STEMS=(course-shelf components color-system design-styles)
 fi
 
 for STEM in "${STEMS[@]}"; do