refactor(css): move cookbook, research, memory and settings styles to their own file

Last step of splitting static/style.css by panel. This moves the cookbook,
deep research, memory and settings rules that can move into
static/css/cookbook-research-memory-settings.css.

After the three steps style.css still holds the shell and every rule whose
move would change the cascade, which on this branch is most of the file.
Eager ordered links, verbatim moves, no rendering change.

static/css/documents-gallery-editor.css

@@ -11,6 +11,7 @@
  *   1. static/style.css
  *   2. static/css/documents-gallery-editor.css
  *   3. static/css/email-calendar-notes-tasks.css
+ *   4. static/css/cookbook-research-memory-settings.css
  *
  * Rules were moved verbatim. A rule stays in style.css when its selector group
  * covers more than one panel, when the class is shared design language used by

static/css/email-calendar-notes-tasks.css

@@ -11,6 +11,7 @@
  *   1. static/style.css
  *   2. static/css/documents-gallery-editor.css
  *   3. static/css/email-calendar-notes-tasks.css
+ *   4. static/css/cookbook-research-memory-settings.css
  *
  * Rules were moved verbatim. A rule stays in style.css when its selector group
  * covers more than one panel, when the class is shared design language used by

static/index.html

@@ -253,6 +253,7 @@
        PRECACHE list in sw.js. None of them is lazy-loaded. -->
   <link rel="stylesheet" href="/static/css/documents-gallery-editor.css?v=20260923csssplit1">
   <link rel="stylesheet" href="/static/css/email-calendar-notes-tasks.css?v=20260923csssplit2">
+  <link rel="stylesheet" href="/static/css/cookbook-research-memory-settings.css?v=20260923csssplit3">
   <link rel="modulepreload" href="/static/app.js?v=20260921chatgptusage2">
 <link rel="modulepreload" href="/static/js/chat.js?v=20260917toolttft1">
   <link rel="modulepreload" href="/static/js/ui.js?v=20260916largetoolscroll1">

static/sw.js

@@ -7,7 +7,7 @@
 //   - Other static assets (images/fonts/libs): cache-first with bg refresh.
 //   - API / non-GET: never cached.
 // Bump CACHE_NAME whenever the precache list or SW logic changes.
-const CACHE_NAME = 'odysseus-v653-css-split-2';
+const CACHE_NAME = 'odysseus-v654-css-split-3';
 
 // KaTeX resolves these from its own stylesheet, so caching the CSS without them
 // gives offline math fallback glyphs instead of proper typesetting.
@@ -42,6 +42,7 @@ const PRECACHE = [
   '/static/style.css?v=20260921chatgptusage2',
   '/static/css/documents-gallery-editor.css?v=20260923csssplit1',
   '/static/css/email-calendar-notes-tasks.css?v=20260923csssplit2',
+  '/static/css/cookbook-research-memory-settings.css?v=20260923csssplit3',
   '/static/app.js?v=20260921chatgptusage2',
   '/static/js/storage.js',
   '/static/js/appConfig.js',