docs(sw): AI rules, example E, tests and evidence for the popup / footer / header changes

AI documents (packages/sw/ai)
- SWPopupPropertyRow, SWSelect, SWSlider in the catalog, usage table,
  composition patterns and design rules; SWViewerSlider noted as SWSlider panel.
- Rule: the SWHeader layer / color dropdowns are header-only; popup layer /
  color / line style use SWPopupPropertyRow (property window pickers).
- Footer rules: gra-border-orange surfaces, Model / Layout text unchanged on
  hover, side button hover, vacant surface limited to the slot row.
- Header rules: measured More growing behavior (hysteresis fix A).
- Example E (custom popup) uses SWPopupPropertyRow, SWSelect and SWSlider
  instead of SWHeaderLayerMenu in the popup.

Tests (packages/sw/tests)
- New footer-popup-viewer-refinement.browser.mjs (47 checks: footer stories,
  hover / gradient / tab text / pocket, popup pickers vs property window rows,
  SWSlider, unit SWSelect parity, Popup B, header trace, viewer title art).
- integrated-popup / integrated-consumer: popup pickers and SWSelect instead of
  the header dropdown and the HM UI Select (same overlay / callback / Escape
  requirements).
- integrated-improvement: default sections skip the retired SW/Tool story
  ('tool' still runs by name); storybook-inventory / simplification record the
  retired footer IDs; theme-inheritance widths use sw-footer--full-footer.

Docs (docs/sw)
- sw-footer-popup-viewer-refinement-2026-10-20.md: causes, decisions (the
  first-pass "header dropdown in popup" change is marked withdrawn),
  verification and baseline failures; evidence footer-popup-viewer-refinement-qa
  (47/47). Footer mapping document updated for the removed sections.

Baseline failures (unchanged by this work): home-menu-integration 1,
storybook-unused-removal 5 (10-19 snapshot comparisons), range-cross-browser and
property-panel-comparison open stories retired on 2026-10-19.

packages/sw/tests/storybook-simplification.browser.mjs

@@ -32,6 +32,8 @@ check(`direct URL render: ${sw.length} SW Stories, no error display / page error
 // 2. removed IDs are gone
 const removed = ['figma', 'capture-active', 'capture-outline', 'capture-recent', 'variants', 'recent-files'].map(id => `sw-header--home-menu-${id}`)
 check('removed Home Menu IDs absent from index', removed.every(id => !index.entries[id]))
+// 2026-10-20 Footer cleanup: retired Footer IDs are gone, the two main Footer Stories stay.
+check('removed Footer IDs absent, full-footer / figma-variants kept', ['sw-footer--default', 'sw-footer--states'].every(id => !index.entries[id]) && ['sw-footer--full-footer', 'sw-footer--figma-variants'].every(id => index.entries[id]))
 // 3. Property panel in Popup: four states
 await page.goto(`${base}/iframe.html?id=sw-header--property-panel-compare&viewMode=story`)
 await page.locator('[data-compare]').first().waitFor()