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/verify/integrated-improvement-result.json

@@ -510,14 +510,14 @@
       "data": {
         "cHome": {
           "x": 360,
-          "y": 285.5,
+          "y": 6118.5,
           "w": 80,
           "h": 48,
           "right": 440
         },
         "cOpen": {
           "x": 425,
-          "y": 285.5,
+          "y": 6118.5,
           "w": 58.265625,
           "h": 48,
           "right": 483.265625