feat(sw): refine headers, status label, popups and AI guide rules

- SW Header: the five field previews hide and return together in one
  measured step; from 760 to 1920px the groups from 레이어 to 치수스타일
  share the room left before 속성보기, above 1920px they keep the 1920
  widths (controls bars and < 760px unchanged)
- SW Viewer Header Model / Layout: long names ellipsize in equal buttons
  (minmax(0, 1fr), name counted at --hm-sw-viewer-tab-name-basis) so they
  never change the box or the measured steps; green outer outline and its
  tokens removed; 378px / 42px, text-shadow and state unchanged
- SWViewerStatus: the label keeps the width of its widest real state text
  (idle keeps its icon slot), so a state change never moves the header;
  with too little room it ellipsizes after the file name gives way
- Popups: body inset shadow removed, title SVG drop shadow removed, viewer
  panel title icons use --hm-sw-viewer-panel-icon-color (#c7bda9)
- Storybook: SW/Viewer › Model / Layout story removed
- AI guide (docs/ai + package copies): design-only changes for every
  component, content limits for Submodule consumers (Header excluded),
  Submodule usage rules; VIEWER / DESIGN_RULES synced
- viewer.browser.mjs: explicit 1920 / 1440 labels and approved 1280
  icon-only expectations

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packages/sw/src/assets/property-title.svg

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