feat(sw): viewer layer bulb, popup toggle switch, footer layout and 1440px story inner

- SW Viewer layer popup: search + 전체 레이어 fixed, only the list scrolls; the all-layers
  control is the SWLayerVisibilityIcon bulb (role="switch"), one light #d2c8b4 line under it.
- Example H and the layer popup AI docs follow the bulb layout (VIEWER, DESIGN_RULES,
  COMPONENT_CATALOG, COMPOSITION_PATTERNS, AI_GUIDE sync).
- Popup toggle switch (Figma toggle_btn_new 633:75188 / 633:75902): one sw.css face for the
  HM UI Switch in SWPopup and SWViewerSwitch in SWViewerPanel; SW Header switches unchanged.
- SW Footer stories: no inner scrollers, fluid screens; workspace fits the viewport.
- SW Footer category tabs keep their positions when selected (divider slots kept, pocket
  edges drawn over the neighbours' padding).
- Storybook .sb-page-inner: 1440px max from 1920px (was 80vw).
- SW Header equal-split change was cancelled; header CSS unchanged.

Verified: check:ai-docs PASS, viewer test 49 PASS (1 FAIL hover face + timeout pre-existing),
footer-design-review 21 PASS, browser checks of switch/footer/inner.
Not verified: footer-popup-viewer-refinement (needs full Storybook build), text-weight/hover
tests, Switch 37x16 AI docs (deferred).

src/sw/sw-footer-stories.css

@@ -2,7 +2,9 @@
    hm-sw-* classes. Surfaces behind standalone parts read the public --hm-sw-footer-* tokens. */
 .sw-footer-story-screen { position: relative; display: flex; flex-direction: column; background: #060606; }
 .sw-footer-story-canvas { position: relative; background: var(--sw-story-canvas); }
-.sw-footer-story-workspace { display: flex; flex-direction: column; height: 720px; background: #060606; }
+/* 2026-10-22: the workspace fits the viewport under the page title (720px at most), so the page itself does not
+   scroll where there is room; a short window keeps 480px and the page scrolls instead of clipping. */
+.sw-footer-story-workspace { display: flex; flex-direction: column; height: clamp(480px, calc(100dvh - 210px), 720px); background: #060606; }
 .sw-footer-story-canvas--fill { flex: 1 1 auto; min-height: 0; }
 .sw-footer-story-nodes { display: flex; flex-wrap: wrap; align-items: flex-start; gap: 16px; }
 .sw-footer-story-node { margin: 0; padding: 12px; border: 1px solid #dedbd2; border-radius: 6px; background: #fff; }