ui: clean up self entry in peer list

Replace bold duplicate-looking self row with dimmed name + small accent
"you" badge. Removes the ID (already shown in identity section at top).

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

web/src/components/Sidebar.tsx

@@ -92,8 +92,8 @@ export function Sidebar() {
         {/* Self */}
         <div className="peer-row peer-row-self">
           <span className="peer-dot" style={{ background: 'var(--accent)' }} />
-          <span className="peer-row-alias" style={{ fontWeight: 700 }}>{displayAlias || '…'}</span>
-          <span className="peer-row-id">{displayId.slice(0, 8)}</span>
+          <span className="peer-row-alias">{displayAlias || '…'}</span>
+          <span className="peer-row-you">you</span>
         </div>
 
         {connectedPeers.length === 0 && (