Add 150 UI and page state stickers in three pending sections

404s, loaders, success, errors, empty states, confirmation, under
construction, offline and more: 50 monochrome (ui), 50 colored (uicolor)
and 50 with an anime girl (uianime), on /test until approved.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

gen/ui/done/checklist.js

@@ -0,0 +1,24 @@
+// clipboard checklist: the three boxes get ticked one by one, the clipboard does a happy hop, then the ticks pop away
+const{sin,PI,min,max,hypot}=Math,T=2*PI
+export const frames=24,delay=70
+const cl=u=>min(1,max(0,u)),L=hypot(9,10)+hypot(21,27)
+export default(c,t)=>{
+  const h=t>.66&&t<.82?sin((t-.66)/.16*PI):0,out=1-cl((t-.88)/.08)
+  c.translate(128,234-10*h);c.scale(1-.03*h,1+.02*h);c.translate(-128,-234)
+  c.fillStyle='#ddd';c.beginPath();c.roundRect(50,52,156,182,16);c.fill();c.stroke()
+  c.fillStyle='#fff';c.lineWidth=5;c.beginPath();c.roundRect(66,70,124,148,6);c.fill();c.stroke()
+  c.lineWidth=7;c.beginPath();c.arc(128,40,16,0,T);c.fill();c.stroke()
+  c.beginPath();c.roundRect(92,44,72,26,9);c.fill();c.stroke()
+  c.lineWidth=5;c.beginPath();c.arc(128,38,5,0,T);c.stroke()
+  for(let k=0;k<3;k++){
+    const y=104+k*48,s=.06+k*.18,p=cl((t-s)/.12),q=cl((t-s-.12)/.1),b=1+.22*sin(q*PI)
+    c.save();c.translate(96,y);c.scale(b,b)
+    c.lineWidth=6;c.beginPath();c.roundRect(-15,-15,30,30,7);c.fill();c.stroke();c.restore()
+    c.lineWidth=10;c.strokeStyle='#bbb';c.beginPath();c.moveTo(126,y-6);c.lineTo([168,154,174][k],y-6);c.moveTo(126,y+8);c.lineTo([150,166,140][k],y+8);c.stroke()
+    c.strokeStyle='#111'
+    if(p>0&&out>0){
+      c.save();c.translate(96,y);c.scale(out,out);c.lineWidth=11;c.setLineDash([L*p,999])
+      c.beginPath();c.moveTo(-10,-1);c.lineTo(-1,9);c.lineTo(20,-18);c.stroke();c.restore()
+    }
+  }
+}