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).

packages/sw/src/theme/sw-viewer.css

@@ -490,9 +490,7 @@ button.hm-sw-viewer-header__brand { text-align: left; }
 .hm-sw-viewer-switch[data-state="checked"] { background: var(--hm-sw-viewer-switch-on); }
 .hm-sw-viewer-switch[data-state="checked"] .hm-sw-viewer-switch__thumb { transform: translateX(16px); background: var(--hm-sw-viewer-switch-thumb-on); }
 .hm-sw-theme .hm-sw-viewer-switch:disabled { opacity: var(--hm-sw-viewer-disabled-opacity); cursor: not-allowed; }
-.hm-sw-viewer-panel .hm-sw-viewer-switch { background: var(--hm-sw-viewer-panel-switch-off); box-shadow: none; }
-.hm-sw-viewer-panel .hm-sw-viewer-switch .hm-sw-viewer-switch__thumb { background: #fff; }
-.hm-sw-viewer-panel .hm-sw-viewer-switch[data-state="checked"] { background: var(--hm-sw-viewer-panel-switch-on); }
+/* Panel switches: the SW popup toggle face in sw.css (Figma toggle_btn_new, 2026-10-22). */
 @media (prefers-reduced-motion: reduce) { .hm-sw-viewer-switch, .hm-sw-viewer-switch__thumb { transition: none; } }
 
 /* ---------- Dropdown ---------- */