style(aigc-topbar): adjust styles and remove unused font

remove unused znicons font face declaration
resize back button to 36px
adjust search bar styling: remove padding and border, update height
update wallet button padding and remove excess box shadow
adjust inner button border radius to 50px

src/pages-aigc/components/AigcTopBar/styles/index.scss

@@ -1,8 +1,3 @@
-@font-face {
-  font-family: znicons;
-  src: url("@/static/fonts/znicons.ttf");
-}
-
 .aigc-topbar {
   position: relative;
   z-index: 3;
@@ -27,9 +22,9 @@
 }
 
 .aigc-topbar-back {
-  flex: 0 0 40px;
-  width: 40px;
-  height: 40px;
+  flex: 0 0 36px;
+  width: 36px;
+  height: 36px;
   display: flex;
   align-items: center;
   justify-content: center;
@@ -52,13 +47,11 @@
   flex: 1 1 auto;
   width: auto;
   min-width: 0;
-  height: 40px;
+  height: 36px;
   display: grid;
   grid-template-columns: minmax(0, 1fr) 36px;
   align-items: center;
   gap: 6px;
-  padding: 2px 3px;
-  border: 1px solid rgba(255, 255, 255, 0.76);
   border-radius: 999px;
   background: rgba(255, 255, 255, 0.86);
   box-shadow: 0 8px 18px rgba(18, 48, 56, 0.08);
@@ -73,7 +66,7 @@
   align-items: center;
   margin: 0;
   padding: 0;
-  border-radius: 16px;
+  border-radius: 50px;
   box-sizing: border-box;
 }
 
@@ -95,12 +88,9 @@
 .aigc-wallet-button {
   justify-content: space-between;
   gap: 6px;
-  padding: 0 9px 0 8px;
+  padding: 0 8px;
   background: #102942;
   color: #ffffff;
-  box-shadow:
-    0 8px 18px rgba(18, 48, 56, 0.1),
-    inset 0 1px 0 rgba(255, 255, 255, 0.12);
 }
 
 .aigc-wallet-label {