feat(wallpaper): add pixel city wallpaper to the wallpaper collection

src/apps/AboutMe.tsx

@@ -11,7 +11,6 @@ export default function AboutMe() {
         <div>
           <h2 style={{ fontSize: 20, fontWeight: 600, marginBottom: 4 }}>Mingda Xie <span style={{ color: 'rgba(255,255,255,0.4)', fontWeight: 400, fontSize: 14 }}>解明达</span></h2>
           <p style={{ fontSize: 13, color: 'rgba(255,255,255,0.6)', lineHeight: 1.5 }}>Backend Developer · CS Master's @ Northeastern University</p>
-          <p style={{ fontSize: 13, color: 'rgba(255,255,255,0.5)' }}>Shenzhen-bound · Class of 2026</p>
         </div>
       </div>
       <div style={{ display: 'flex', gap: 8, flexWrap: 'wrap', marginBottom: 20 }}>
@@ -26,7 +25,7 @@ export default function AboutMe() {
       </div>
       <p style={{ fontSize: 13, color: 'rgba(255,255,255,0.7)', lineHeight: 1.7, marginBottom: 16 }}>
         Backend engineer who runs a personal k3s cluster on Vultr, ships microservices, and builds things that occasionally work in production.
-        LeetCode 400+. Pixel art enjoyer. Stardew Valley veteran. Huge fan of 土屋アンナ.
+        Pixel art enjoyer. Stardew Valley veteran. Huge fan of 土屋アンナ.
       </p>
       <p style={{ fontSize: 12, color: 'rgba(255,255,255,0.3)', fontStyle: 'italic' }}>
         "I am the dragon scroll, bitch." — Genuine mastery over shortcuts.

src/components/Desktop/Desktop.css

@@ -2,6 +2,7 @@
   position: fixed;
   inset: 0;
   background-size: 24px 24px, 12px 12px, cover;
+  background-position: center;
   overflow: hidden;
 }
 

src/components/Desktop/Desktop.tsx

@@ -31,7 +31,10 @@ export default function Desktop() {
   return (
     <div
       className="desktop"
-      style={{ background: WALLPAPERS[state.wallpaper] }}
+      style={{
+        background: WALLPAPERS[state.wallpaper],
+        backgroundSize: WALLPAPERS[state.wallpaper].startsWith('url(') ? 'cover' : undefined,
+      }}
       onContextMenu={handleContextMenu}
       onClick={() => setCtxMenu(null)}
     >

src/config/apps.ts

@@ -107,4 +107,6 @@ export const WALLPAPERS = [
    linear-gradient(135deg, #050510 0%, #06060f 100%)`,
   // Solid dark — flat and minimal
   `linear-gradient(135deg, #050510 0%, #080818 100%)`,
+  // Pixel city — neon cityscape
+  `url(/wallpaper-city.png)`,
 ];