feat(sw): integrated improvement 0.2.0 (popup content, header open, tool buttons)

SW package 0.2.0 integrated improvement (Task A, steps 1-8). All new props are
optional; existing SW Stories are pixel-identical to the previous build (28/28).

- Build reproducibility: dist text normalized to LF, dist/build-info.json
  (commit, dirty, tool versions, no timestamp), packages/sw/.gitattributes
  (eol=lf). LF checkouts give identical dist and tarball.
- SWHeader: documentOpenPlacement ("menu" default | "header": Open right of
  the logo in the existing document-button look, reusing onDocumentOpen and
  documentOpenLabel, no duplicate Open in the dropdown), leading slot,
  hiddenControls sub-items documentNew / documentOpen / layerFreeze /
  layerLock. Open moves into More on measured overflow (with hysteresis).
- showNew / showOpen (SWHeaderDocumentTitle), showFreeze / showLock (layer
  menu, field, property window list).
- SWToolButton (text / pill / document) and SWToolGroup (radio selection),
  reusing the existing toggle, pill and file-name looks.
- SWPopup / SWPopupSection / SWPopupRow on the shared property window frame;
  SWHeaderPropertyPanel gains children, title, autoFocus and optional
  selection / properties / groups. Escape stack for several popups.
- Field dropdowns inside a popup use the shared fixed overlay
  (useSWFixedDropdownPosition), so the scrolling body no longer clips them.
- AI guide, examples E/F, README, Storybook (SW/Header/Options, SW/Tool,
  SW/Popup) and verification record docs/sw/sw-integrated-improvement-2026-10-19.md.
- Regression scripts rescoped for the intended changes (unused-removal 81/81,
  overview 52/54 with the two pre-existing historical assertions).

Known limitation (unresolved): tools / leading content (incl. SWToolGroup)
does not move into More. With a wide tool bar the configured fields shrink
instead; in Example F the document name and layer field reach 0px at 390px.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

packages/sw/tests/overview.browser.mjs

@@ -6,7 +6,7 @@ import { execFileSync } from 'node:child_process'
 import path from 'node:path'
 import http from 'node:http'
 import { parse } from '@babel/parser'
-import { swStoryEntries, retainedInventory, inventorySignature, retiredDropdownIds } from './storybook-inventory.mjs'
+import { swStoryEntries, retainedInventory, inventorySignature, retiredDropdownIds, integratedChangedFiles } from './storybook-inventory.mjs'
 
 const out = path.resolve(process.argv[2] ?? 'docs/sw/storybook-overview-qa')
 await mkdir(out, { recursive: true })
@@ -24,7 +24,9 @@ const oldStories = stories(baseline), newStories = stories(source)
 const retiredExports = ['LayerDropdown','ColorDropdown','LineStyleDropdown','TextDimensionStyleDropdown','ComposedControls']
 check('retained non-Overview declarations byte-identical; relocated composition separately verified', Object.keys(oldStories).filter(k => k !== 'Overview' && !retiredExports.includes(k)).every(k => oldStories[k] === newStories[k]))
 check('retired Dropdown IDs absent', retiredDropdownIds.every(id => !after.some(e => e.id === id)))
-check('package production source untouched', !execFileSync('git', ['diff', report.baseCommit, '--', 'packages/sw/src'], { encoding:'utf8' }))
+// Since 2026-10-19 the production source changes only in the integrated-improvement files (their own suites verify them).
+const sourceDiff = execFileSync('git', ['diff', '--name-only', report.baseCommit, '--', 'packages/sw/src'], { encoding:'utf8' }).trim().split(/\r?\n/).filter(Boolean)
+check('package production source untouched except the integrated-improvement files', sourceDiff.every(file => integratedChangedFiles.includes(file)), sourceDiff.filter(file => !integratedChangedFiles.includes(file)))
 
 const root = path.resolve('storybook-static'), mime = { '.html':'text/html','.js':'text/javascript','.css':'text/css','.json':'application/json','.svg':'image/svg+xml','.ttf':'font/ttf','.png':'image/png' }
 const server = http.createServer(async(req,res) => {