feat(ui): add icons to sidebar 数字员工 and 会话管理 sections

Align sidebar-section-copy layout with Windows client (flex instead of grid)
to keep icon and text on the same line.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

apps/ui/src/features/shell/ExpertTree.tsx

@@ -128,6 +128,7 @@ export function ExpertTree({
     <section className="sidebar-section compact sidebar-experts-entry">
       <div className="sidebar-section-head sidebar-digital-workers-title">
         <div className="sidebar-section-copy">
+          <span className="sidebar-section-icon" aria-hidden="true">🤖</span>
           <strong className="sidebar-section-title">数字员工</strong>
         </div>
       </div>

apps/ui/src/features/shell/SessionList.tsx

@@ -39,6 +39,7 @@ export function SessionList({
     <section className="sidebar-section sidebar-section-fill compact sidebar-session-section">
       <div className="sidebar-section-head sidebar-section-head-subtle">
         <div className="sidebar-section-copy">
+          <span className="sidebar-section-icon" aria-hidden="true">💬</span>
           <span className="sidebar-section-label">{label}</span>
         </div>
       </div>

apps/ui/src/styles/shell.css

@@ -652,8 +652,9 @@
 
 .sidebar-section-copy {
   min-width: 0;
-  display: grid;
-  gap: 0;
+  display: flex;
+  align-items: center;
+  gap: 6px;
 }
 
 .sidebar-section-label {

apps/ui/src/styles/theme-openclaw.css

@@ -351,6 +351,11 @@
   letter-spacing: 0;
 }
 
+.shell.openclaw-theme .sidebar-section-icon {
+  font-size: 14px;
+  line-height: 1;
+}
+
 .shell.openclaw-theme .sidebar-section-title {
   color: #0f2f59;
   font-size: 13px;