feat: +弹窗只留布局选择/名称；布局扩至6个（新增左一右二/上一下三，2行3列）

01_content/src/client/styles.ts

@@ -83,12 +83,14 @@ export const css = [
   '.dsh-wt_splitDividerH{cursor:row-resize}',
   '.dsh-wt_splitDivider:hover,.dsh-wt_splitDividerH:hover{background:var(--dsw-alias-state-accent-primary,#4f8ef7)}',
   // 新建工作区（拓扑预设）
-  '.dsh-wt_presets{display:flex;gap:6px;padding:2px 8px 6px}',
+  '.dsh-wt_presets{display:grid;grid-template-columns:repeat(3,1fr);gap:6px;padding:2px 8px 6px}',
   '.dsh-wt_preset{flex:1;display:flex;flex-direction:column;align-items:center;gap:4px;padding:6px 2px;border:1px solid var(--dsw-alias-border-l1,#262b36);border-radius:6px;background:transparent;color:var(--dsw-alias-label-secondary,#9aa4b2);font:inherit;font-size:10px;line-height:13px;cursor:pointer}',
   '.dsh-wt_preset:hover{border-color:var(--dsw-alias-border-l2,#3a4150)}',
   '.dsh-wt_preset[data-on=true]{border-color:var(--dsw-alias-state-accent-primary,#4f8ef7);color:var(--dsw-alias-state-accent-primary,#4f8ef7)}',
   '.dsh-wt_thumb{display:flex;flex-direction:column;width:54px;height:36px;border:1px solid var(--dsw-alias-border-l2,#3a4150);border-radius:3px;overflow:hidden;background:var(--dsw-alias-fill-l1,rgba(255,255,255,.03))}',
   '.dsh-wt_thumbRow{flex:1;display:flex;min-height:0}',
+  '.dsh-wt_thumbCols{flex-direction:row}',
+  '.dsh-wt_thumbCol{flex:1;min-width:0;display:flex;flex-direction:column}',
   '.dsh-wt_thumbRow:last-child .dsh-wt_thumbCell{border-bottom:none}',
   '.dsh-wt_thumbCell{flex:1;min-width:0;border-right:1px solid var(--dsw-alias-border-l1,#262b36);border-bottom:1px solid var(--dsw-alias-border-l1,#262b36);display:flex;align-items:center;justify-content:center;font-size:8px;line-height:1}',
   '.dsh-wt_thumbRow .dsh-wt_thumbCell:last-child{border-right:none}',