refactor: 移除共享设置操作相关代码，优化侧边栏布局和样式

tests/sidepanel-operation-delay.test.js

@@ -51,7 +51,6 @@ test('sidepanel splits shared auto-run controls from openai oauth controls', ()
   const stepRangeIndex = html.indexOf('id="row-step-execution-range"');
   const oauthDisplayIndex = html.indexOf('id="row-oauth-display"');
   const oauthCallbackIndex = html.indexOf('id="row-oauth-callback"');
-  const settingsActionsIndex = html.indexOf('id="row-settings-actions"');
 
   assert.notEqual(step6CookieIndex, -1);
   assert.notEqual(sharedAutoRunIndex, -1);
@@ -61,13 +60,11 @@ test('sidepanel splits shared auto-run controls from openai oauth controls', ()
   assert.notEqual(stepRangeIndex, -1);
   assert.notEqual(oauthDisplayIndex, -1);
   assert.notEqual(oauthCallbackIndex, -1);
-  assert.notEqual(settingsActionsIndex, -1);
   assert.ok(sharedAutoRunIndex > step6CookieIndex, 'shared auto-run should render below the openai step6 cookie row');
   assert.ok(threadIntervalIndex > sharedAutoRunIndex, 'thread interval should be part of the shared auto-run block');
   assert.ok(stepRangeIndex > threadIntervalIndex, 'step execution range should render below shared thread interval');
   assert.ok(stepRangeIndex < oauthDisplayIndex, 'step execution range should stay above oauth runtime display');
   assert.ok(oauthCallbackIndex > oauthDisplayIndex, 'openai callback row should follow the oauth display');
-  assert.ok(settingsActionsIndex > oauthCallbackIndex, 'save settings action should live outside the callback row');
 });
 
 test('sidepanel operation delay state is always normalized back to enabled', () => {