fix(toolbar): CLI selector in chat footer, settings gear in header, drop dropdown settings

按同事要求:CLI/agent 选择器移回 chat 底部、header 放设置 gear、删 AvatarMenu 下拉里的设置项、去掉项目说明 sliders。

apps/web/src/components/AvatarMenu.tsx

@@ -475,20 +475,6 @@ export function AvatarMenu({
 
           <div style={{ height: 1, background: 'var(--border-soft)', margin: '4px 6px' }} />
 
-          <button
-            type="button"
-            className="avatar-item"
-            onClick={() => {
-              setOpen(false);
-              onOpenSettings();
-            }}
-          >
-            <span className="avatar-item-icon" aria-hidden>
-              <RemixIcon name="settings-line" size={15} />
-            </span>
-            <span>{t('avatar.settings')}</span>
-            <span className="avatar-item-meta">{isMacPlatform() ? '⌘,' : 'Ctrl+,'}</span>
-          </button>
 
           {onBack ? (
             <>

apps/web/src/components/ProjectView.tsx

@@ -4274,6 +4274,25 @@ export function ProjectView({
   const hasProjectInstructions = projectInstructions.length > 0;
   const projectInstructionsPreview = compactInlinePreview(projectInstructions);
 
+  // CLI / agent selector lives below the chat conversation (composer footer),
+  // not in the top-right header.
+  const executionControls = (
+    <AvatarMenu
+      config={config}
+      agents={agents}
+      daemonLive={daemonLive}
+      onModeChange={onModeChange}
+      onAgentChange={onAgentChange}
+      onAgentModelChange={onAgentModelChange}
+      onApiModelChange={onApiModelChange}
+      providerModelsCache={providerModelsCache}
+      onOpenSettings={onOpenSettings}
+      onRefreshAgents={onRefreshAgents}
+      onBack={onBack}
+      placement="up"
+    />
+  );
+
   return (
     <div className="app">
       <CritiqueTheaterMount
@@ -4285,43 +4304,24 @@ export function ProjectView({
         onBack={onBack}
         backLabel={t('project.backToProjects')}
         fileActionsBefore={(
-          <div
-            className="app-chrome-file-actions-before workspace-tabs-file-actions"
-            data-app-chrome-file-actions="true"
-          />
-        )}
-        actions={(
           <>
+            <HandoffButton projectId={project.id} />
             <button
               type="button"
               className="settings-icon-btn"
-              data-testid="project-settings-trigger"
-              title={t('project.customInstructions')}
-              aria-label={t('project.customInstructions')}
-              aria-expanded={instructionsMode !== 'closed'}
-              onClick={() => {
-                setInstructionsDraft(project.customInstructions ?? '');
-                setInstructionsMode(hasProjectInstructions ? 'review' : 'edit');
-              }}
+              onClick={() => onOpenSettings('execution')}
+              title={t('chat.cliSettingsTitle')}
+              aria-label={t('chat.cliSettingsAria')}
             >
-              <Icon name="sliders" size={16} />
+              <Icon name="settings" size={16} />
             </button>
-            <HandoffButton projectId={project.id} />
-            <AvatarMenu
-              config={config}
-              agents={agents}
-              daemonLive={daemonLive}
-              onModeChange={onModeChange}
-              onAgentChange={onAgentChange}
-              onAgentModelChange={onAgentModelChange}
-              onApiModelChange={onApiModelChange}
-              providerModelsCache={providerModelsCache}
-              onOpenSettings={onOpenSettings}
-              onRefreshAgents={onRefreshAgents}
-              onBack={onBack}
+            <div
+              className="app-chrome-file-actions-before workspace-tabs-file-actions"
+              data-app-chrome-file-actions="true"
             />
           </>
         )}
+        actions={null}
       >
         <div className="app-project-title">
           <span className="app-project-title-line">
@@ -4527,6 +4527,7 @@ export function ProjectView({
                 onProjectChange({ ...project, skillId });
               }}
               activePluginSnapshot={activePluginSnapshot}
+              composerFooterAccessory={executionControls}
               currentDesignSystemId={project.designSystemId}
               onActiveDesignSystemChange={(updatedProject) => {
                 onProjectChange(updatedProject);