fix(miniprogram): unify nav headers to dashboard style with tall workbench bar

Co-authored-by: Cursor <cursoragent@cursor.com>

miniprogram/styles/bx-theme.scss

@@ -70,7 +70,7 @@
   padding-top: 5px;
 }
 
-/* Topbar */
+/* Topbar — 对齐仪表盘白底顶栏 */
 .bx-page .topbar {
   position: sticky;
   top: 0;
@@ -79,66 +79,38 @@
   grid-template-columns: minmax(0, 1fr) var(--sq-capsule-right-safe, 96px);
   align-items: center;
   height: var(--sq-header-height, calc(44px + 44px));
-  padding: var(--sq-safe-top, 44px) 12px 0;
+  padding: var(--sq-safe-top, 44px) 12px 0 8px;
   box-sizing: border-box;
-  background: rgba(255, 255, 255, 0.92);
-  box-shadow: 0 1px 0 rgba(217, 232, 226, 0.85), 0 8px 20px rgba(15, 23, 42, 0.06);
-}
-
-.bx-page .topbar::before {
-  content: '';
-  position: absolute;
-  left: 0;
-  right: 0;
-  top: 0;
-  height: var(--sq-header-height, calc(44px + 44px));
-  background: linear-gradient(
-    135deg,
-    rgba(16, 185, 129, 0.1),
-    rgba(236, 253, 245, 0.55) 45%,
-    rgba(255, 255, 255, 0) 100%
-  );
-  pointer-events: none;
-}
-
-.bx-page .topbar > view,
-.bx-page .topbar > text {
-  position: relative;
+  background: #fff;
+  border-bottom: 1px solid #eee;
+  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
 }
 
 .bx-page .topbar-left {
   display: flex;
   align-items: center;
   justify-content: flex-start;
-  gap: 4px;
+  gap: 8px;
   min-width: 0;
 }
 
 .bx-page .topbar-back {
-  width: 40px;
-  height: 40px;
-  display: flex;
-  align-items: center;
-  justify-content: center;
-  color: var(--text);
-  border-radius: 10px;
+  font-size: 20px;
+  color: #333;
+  padding: 4px 8px;
   flex-shrink: 0;
+  line-height: 1;
 }
 
 .bx-page .topbar-back:active {
   opacity: 0.75;
 }
 
-.bx-page .topbar-back-icon {
-  font-size: 22px;
-  line-height: 1;
-  font-weight: 500;
-}
-
 .bx-page .topbar-title {
   text-align: left;
   font-size: 17px;
-  font-weight: 800;
+  font-weight: 700;
+  color: #111827;
   max-width: 100%;
   overflow: hidden;
   text-overflow: ellipsis;