docs(storybook): make Expanded OrgChart a preview-only page

Remove the data, layout, interaction and employee-popup setting panels
from the Expanded OrgChart Story. The chart now renders a fixed sample
(7 companies x 20, TB, all expanded, collapse/zoom/pan on, Drag & Drop
off, HM Dialog) right under the page title. Story ID, OrgChart packages
and public API are unchanged.

Align the Story browser checks (P7, P8, P9, P9.2-P9.5, geometry, popup
parity, hierarchy, HM Story) with the preview: setting-only scenarios
are removed, chart rendering, collapse, Zoom/Pan/Fit and HM Dialog checks
run on the fixed state. Move/Drag & Drop coverage stays in the Vanilla
Core checks (verify-p9-3-core, verify-p9-4-core).

Verified: tsc, test:guard 94/94, node --check on 11 scripts, changed
browser sections PASS. Pre-existing P7 story-menu, P8 Department
long-name, P9 Expanded tb/runner failures remain separate issues.
verify-p9-5-popup-parity was not run (needs the Vanilla example server).

examples/org-chart/verify-p9.mjs

@@ -48,7 +48,6 @@ async function ready(requirePage = true) {
 }
 async function goto(name, size = sizes[1]) { expectedHosts = name === 'overview' ? 3 : 1; await page.setViewportSize(size); await page.goto(`${origin}/iframe.html?id=${stories[name]}&viewMode=story`); await ready(); }
 async function capture(name, fullPage = true) { await page.screenshot({ path: path.join(output, name + '.png'), fullPage }); }
-async function select(label, option) { await page.getByRole('combobox', { name: label, exact: true }).click(); await page.getByRole('option', { name: option, exact: true }).click(); await ready(); }
 async function section(name, work) { if (!run(name)) return; try { await work(); } catch (error) { check(false, `${name}: runner completed`, { message: error.message, stack: error.stack }); } }
 const equal = (a, b) => JSON.stringify(a) === JSON.stringify(b);
 
@@ -188,8 +187,8 @@ try {
     await section('expanded', async () => {
       for (const size of selectedSizes) {
         await goto('expanded', size);
-        for (const [option, type] of [['세로형 TB', 'tb'], ['가로형 LR', 'lr'], ['혼합형 Hybrid', 'hybrid']]) {
-          if (type !== 'tb') await select('조직도 표시 유형', option);
+        // Expanded is preview-only (2026-10-22): the fixed TB default is the only layout the Story shows.
+        { const type = 'tb';
           const state = await snapshot(); measurements.push({ name: `Expanded ${type} ${size.width}`, state });
           check(state.auto?.type === type && state.auto.employees === 20 && fitted(state) && noHorizontalOverflow(state), `Expanded ${type} ${size.width}: representative layout renders unchanged sample and Fits`, state.auto);
           check(state.auto?.titles.length > 0 && state.auto.titles.every(title => title.color === '#ffffff' && title.buttonColor === '#ffffff' && title.background === colors[title.company]) && new Set(state.auto.titles.map(title => title.company)).size === 7, `Expanded ${type} ${size.width}: all company title backgrounds and white text preserved`, state.auto?.titles);