fix(polish): clean up HomeScreen dead code and token drift

- Remove dead .active-profile-row CSS (unused class)
- Replace hardcoded rgba fallbacks in .home-profile-row.is-active with
  design tokens (var(--surface-2), var(--border))
- Remove duplicate edit icon from publication empty state (icon was
  shown above the button, redundant with the button's own icon)

frontend/src/screens/HomeScreen.tsx

@@ -226,7 +226,6 @@ function PublicationResult({
   if (!lastPublish) {
     return (
       <div className="home-publish-empty">
-        <Icon name="edit" size={20} />
         <p className="muted">
           You haven't published anything yet.
         </p>

frontend/src/styles.css

@@ -1411,12 +1411,6 @@ select {
   gap: 20px;
 }
 
-.active-profile-row {
-  display: flex;
-  align-items: center;
-  gap: 14px;
-}
-
 .active-profile-meta {
   flex: 1;
   min-width: 0;
@@ -1539,8 +1533,8 @@ select {
 }
 
 .home-profile-row.is-active {
-  background: var(--token-item-bg, rgba(0, 0, 0, 0.04));
+  background: var(--surface-2);
-  border-color: var(--token-border, rgba(0, 0, 0, 0.12));
+  border-color: var(--border);
 }
 
 .home-profile-row:not(.is-active) {