feat(sw): integrate home menu into SWHeader (Task A + B)

Combine Task A (e8409ef, SW 0.2.0 integrated improvement) with Task B
(396539d, Figma-based SWHomeMenu / SWHomeMenuSection / SWHomeMenuItem /
SWRecentFiles). Task B's 84 new files are taken unchanged except for the
public-import Storybook update and joining the popup Escape stack.

- Export the home menu from @hm-design/sw
- SWHeader homeMenu / homeMenuOpen / defaultHomeMenuOpen /
  onHomeMenuOpenChange: hidden by default, the logo toggles it (onHomeClick
  is not called while homeMenu is set), placed from the measured header,
  closes with / closes the document and field dropdowns
- Logo aria-expanded / aria-controls; menu layer CSS (z-index 20)
- AI catalog / patterns / design rules, example G, README, usage guide
- Storybook SW/Home Menu uses @hm-design/sw; integration story

Verified: SW typecheck, tsc -b, SW build, Storybook build, AI docs 22/22,
28/28 existing SW shots pixel-identical, regression 96 PASS / 0 FAIL,
home menu checks 22/22. Not run: tarball consumer install.

src/sw/assets/home-menu/new-file.svg

@@ -0,0 +1,25 @@
+<svg preserveAspectRatio="none" overflow="visible" style="display: block;" width="20" height="23" viewBox="0 0 20 23" fill="none" xmlns="http://www.w3.org/2000/svg">
+<g id="insert_drive_file">
+<g id="Union" opacity="0.8" filter="url(#filter0_dd_0_439)">
+<path d="M11.5 4H5.5C4.675 4 4.0075 4.675 4.0075 5.5L4 17.5C4 18.325 4.6675 19 5.4925 19H14.5C15.325 19 16 18.325 16 17.5V8.5L11.5 4ZM5.5 17.5V5.5H10.75V9.25H14.5V17.5H5.5ZM10 12.5H12V13.5H10V15.5H9V13.5H7V12.5H9V10.5H10V12.5Z" fill-rule="evenodd" clip-rule="evenodd" fill="#B6B4AF"/>
+</g>
+</g>
+<defs>
+<filter id="filter0_dd_0_439" x="0" y="0" width="20" height="23" filterUnits="userSpaceOnUse" color-interpolation-filters="sRGB">
+<feFlood flood-opacity="0" result="BackgroundImageFix"/>
+<feColorMatrix in="SourceAlpha" type="matrix" values="0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 127 0" result="hardAlpha"/>
+<feOffset/>
+<feGaussianBlur stdDeviation="2"/>
+<feComposite in2="hardAlpha" operator="out"/>
+<feColorMatrix type="matrix" values="0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0"/>
+<feBlend mode="normal" in2="BackgroundImageFix" result="effect1_dropShadow_0_439"/>
+<feColorMatrix in="SourceAlpha" type="matrix" values="0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 127 0" result="hardAlpha"/>
+<feOffset/>
+<feGaussianBlur stdDeviation="0.5"/>
+<feComposite in2="hardAlpha" operator="out"/>
+<feColorMatrix type="matrix" values="0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0.5 0"/>
+<feBlend mode="normal" in2="effect1_dropShadow_0_439" result="effect2_dropShadow_0_439"/>
+<feBlend mode="normal" in="SourceGraphic" in2="effect2_dropShadow_0_439" result="shape"/>
+</filter>
+</defs>
+</svg>