feat(HEL-571): 网站图标全部换成新太极Logo

Co-authored-by: multica-agent <github@multica.ai>

frontend/shared/shell.css

@@ -787,6 +787,18 @@ body.sidebar-collapsed .app-main {
   height: 27px;
 }
 
+.brand-mark img {
+  width: 100%;
+
+  height: 100%;
+
+  display: block;
+
+  border-radius: inherit;
+
+  object-fit: cover;
+}
+
 .market-item {
   color: var(--text-muted);
 
@@ -1221,16 +1233,6 @@ body.sidebar-collapsed .app-main {
   }
 }
 
-.brand-glyph {
-  font-family: "Songti SC", SimSun, serif;
-
-  font-size: 14px;
-
-  font-weight: 800;
-
-  line-height: 1;
-}
-
 .workspace-view:not(#heavenView) .section-toolbar:first-child {
   min-height: 32px;
 
@@ -1339,6 +1341,18 @@ body.sidebar-collapsed {
   font-weight: 700;
 }
 
+.sidebar-brand-mark img {
+  width: 100%;
+
+  height: 100%;
+
+  display: block;
+
+  border-radius: inherit;
+
+  object-fit: cover;
+}
+
 .sidebar-brand strong {
   color: var(--r2-ink);