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-storybook-unused-removal/story-inventory-after.json

@@ -1,5 +1,5 @@
 {
-  "total": 336,
+  "total": 334,
   "sw": [
     {
       "id": "sw-header--composed-controls",
@@ -11,6 +11,26 @@
         "manifest"
       ]
     },
+    {
+      "id": "sw-header--document-open",
+      "name": "Document Open",
+      "title": "SW/Header",
+      "tags": [
+        "dev",
+        "test",
+        "manifest"
+      ]
+    },
+    {
+      "id": "sw-header--hidden-sub-controls",
+      "name": "Hidden Sub Controls",
+      "title": "SW/Header",
+      "tags": [
+        "dev",
+        "test",
+        "manifest"
+      ]
+    },
     {
       "id": "sw-header--detail-buttons",
       "name": "Detail Buttons (Shared States)",