style(sw): viewer popup typography, 전체 레이어 title and options layout

- Property popup: row labels 14px 500, read-only values 14px in the panel text
  color, monospace removed; 일반 정보 / 기하 속성 groups 20px apart
  (--hm-sw-viewer-panel-spacing on the second section).
- Layer popup: 전체 레이어 is a plain SWViewerSection title (existing
  .hm-sw-viewer-section__title) with the all-layers switch on the same row;
  layer names 14px 500, no monospace.
- Options popup follows the user image: 표시 (LWDISPLAY), 표시 배율 with the
  px/mm unit on the input row, updated lineweight hints.
- Remove stray monospace font-family from SW Story CSS.
- VIEWER.md §4.1 / new §4.2, DESIGN_RULES §11, Example H aligned.

packages/sw/ai/examples/example-layout.css

@@ -36,12 +36,14 @@
 }
 /* Viewer layer list (example H), the same look as Storybook SW/Viewer's layer popup. Panel tokens only.
    Layer visibility is a 24 x 24 button around SWLayerVisibilityIcon (header bulb), never a switch or checkbox;
-   the all-layers control above the list is SWViewerField + SWViewerSwitch. */
+   the all-layers control above the list is SWViewerSection title="전체 레이어" + SWViewerSwitch on one row. */
 .app-viewer-layers { display: flex; flex-direction: column; gap: 4px; margin: 0; padding: 0; list-style: none; }
 .app-viewer-layers > li { display: flex; align-items: center; gap: 8px; padding: 4px 6px; border-radius: 3px; }
 .app-viewer-layers > li:hover { background: rgba(154, 146, 132, 0.25); }
 .app-viewer-layers > li[data-visible="false"] { opacity: 0.45; }
+/* 전체 레이어: the plain SWViewerSection laid out as one row — title (.hm-sw-viewer-section__title) left, switch right. */
+section.app-viewer-all-layers { flex-direction: row; align-items: center; justify-content: space-between; min-height: 20px; }
 .app-viewer-layer-swatch { flex: 0 0 10px; width: 10px; height: 10px; border: 1px solid var(--hm-sw-viewer-panel-inner-border); border-radius: 9999px; }
-.app-viewer-layer-name { flex: 1; min-width: 0; overflow: hidden; white-space: nowrap; text-overflow: ellipsis; font-family: ui-monospace, monospace; font-size: 12px; }
+.app-viewer-layer-name { flex: 1; min-width: 0; overflow: hidden; white-space: nowrap; text-overflow: ellipsis; font-size: 14px; font-weight: 500; }
 .app-viewer-layer-bulb { display: inline-flex; align-items: center; justify-content: center; width: 24px; height: 24px; padding: 0; border: 0; border-radius: 4px; background: none; cursor: pointer; }
 .app-viewer-layer-bulb:hover { background: rgba(154, 146, 132, 0.3); }