refactor(storybook): consolidate property panel comparison layout

Keep sw-header--property-panel-compare as the single property panel state
page: the four existing SWHeaderPropertyPanel states in 2 columns x 2 rows
at their original size, inside a scrolling Inner. Remove the duplicate
Property Panel Variants and the four single-state Stories (SW 24 -> 19).
Storybook-only change; SW runtime and public API untouched.

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

packages/sw/tests/storybook-inventory.mjs

@@ -1,6 +1,8 @@
 // Current SW inventory after the approved stage-1 and Dropdown consolidations.
 export const retiredStage1Ids = ['responsive', 'text-stroke', 'dynamic-data', 'default', 'controls'].map(id => `sw-header--${id}`)
 export const retiredDropdownIds = ['layer-dropdown', 'color-dropdown', 'line-style-dropdown', 'text-dimension-style-dropdown'].map(id => `sw-header--${id}`)
+// 2026-10-19: duplicate property panel demos; the four states live on sw-header--property-panel-compare.
+export const retiredPropertyPanelIds = ['property-panel-variants', 'property-panel-none', 'property-panel-all', 'property-panel-circle', 'property-panel-expanded'].map(id => `sw-header--${id}`)
 // Include the old title when reading historical evidence; live hierarchy is asserted separately.
 export const swStoryEntries = index => Object.values(index.entries).filter(entry => entry.type === 'story' && (entry.title === 'SW/Header' || entry.title === 'SW/Header/Dropdown'))
 export const retainedInventory = entries => entries.filter(entry => ![...retiredStage1Ids, ...retiredDropdownIds].includes(entry.id))