完善UI

core/frontend/src/design-restraint.css

@@ -229,6 +229,7 @@ body.sidebar-collapsed .app { grid-template-columns: 96px 1fr; }
 /* ─── Sidebar ─── */
 aside.sidebar {
   --klein: #002fa7;
+  --st-black: #101012;
   padding: 0;
   border-right: 1px solid rgba(27, 32, 40, 0.08);
   background: rgba(28, 34, 43, 0.035);
@@ -414,6 +415,7 @@ aside.sidebar .nav-panel {
   height: calc(100vh - 116px);
   min-height: 0;
   padding-top: 14px;
+  padding-bottom: 82px;
   overflow-x: hidden;
   overflow-y: auto;
 }
@@ -535,6 +537,55 @@ aside.sidebar .nav-subitem.active::before {
   opacity: 1;
   box-shadow: 0 0 0 4px rgba(0, 47, 167, 0.10);
 }
+
+aside.sidebar .org-switcher {
+  position: absolute;
+  z-index: 6;
+  left: 12px;
+  right: 6px;
+  bottom: 24px;
+  display: flex;
+  align-items: center;
+  gap: 8px;
+  margin: 0;
+  padding: 0;
+  border: 0;
+  background: transparent;
+  color: #31343a;
+  font: inherit;
+  font-size: 14px;
+  text-align: left;
+  cursor: pointer;
+}
+aside.sidebar .org-switcher-name {
+  min-width: 0;
+  flex: 1;
+  overflow: hidden;
+  text-overflow: ellipsis;
+  white-space: nowrap;
+}
+aside.sidebar .org-switcher svg { width: 16px; height: 16px; flex-shrink: 0; color: #575f6f; }
+aside.sidebar .org-badge {
+  width: 34px;
+  height: 34px;
+  flex-shrink: 0;
+  display: grid;
+  place-items: center;
+  overflow: hidden;
+  border-radius: 50%;
+  color: #fff;
+  background: var(--st-black);
+  font-weight: 600;
+  font-size: 13px;
+}
+aside.sidebar .org-badge img { width: 100%; height: 100%; object-fit: cover; display: block; }
+body.sidebar-collapsed aside.sidebar .org-switcher {
+  left: 0;
+  right: 0;
+  justify-content: center;
+}
+body.sidebar-collapsed aside.sidebar .org-switcher-name,
+body.sidebar-collapsed aside.sidebar .org-switcher svg { display: none; }
 aside.sidebar .nav-subitem .pill-mini {
   margin-left: auto;
   min-width: 18px;
@@ -947,28 +998,6 @@ main { position: relative; background: #fff; min-width: 0; }
   letter-spacing: .02em;
 }
 
-/* ─── Topbar · 头像 ─── */
-.topbar-avatar {
-  width: 40px; height: 40px;
-  border-radius: var(--r-pill);
-  background: var(--accent-black);
-  color: var(--accent-white);
-  display: inline-flex; align-items: center; justify-content: center;
-  font-size: 13px; font-weight: 600;
-  cursor: pointer;
-  border: 1px solid var(--border-faint);
-  transition: transform var(--t-fast), box-shadow var(--t-base);
-  flex-shrink: 0;
-  overflow: hidden;
-}
-.topbar-avatar:hover {
-  transform: scale(1.04);
-  box-shadow: 0 0 0 3px var(--heat-12);
-}
-.topbar-avatar img {
-  width: 100%; height: 100%; object-fit: cover;
-}
-
 /* ─── Content ─── */
 .content {
   /* 对齐 HTML 设计稿 #page-content(24px 28px 60px):原 48px 顶距使全站标题整体偏低 24px */