refactor(storybook): fold SW Header Options stories into SW/Header

Remove the separate SW/Header/Options sidebar item. Its examples move to two
Stories directly under SW/Header (src/sw/sw-header-open.stories.tsx):
- Document Open: Open placement, label, 10-width responsive, composed bar,
  composed (controls) responsive
- Hidden Sub Controls: document New / Open and layer freeze / lock removal

No public API or component change. Tests and inventory follow the new IDs
(integrated 97/97, existing Stories pixel-identical 28/28, unused-removal
83/83). The two remaining overview failures are pre-existing historical
assertions (also failing on 5faa1f1), not new defects.

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

docs/sw/integrated-improvement-qa/final-overview/chrome-result.json

@@ -644,6 +644,8 @@
   "browser": "155.0.8059.80",
   "managerOrder": [
     "sw-header--composed-controls",
+    "sw-header--document-open",
+    "sw-header--hidden-sub-controls",
     "sw-header--overview",
     "sw-header--interactive-states",
     "sw-header--window-move-motion",