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/loading/dots.js

@@ -0,0 +1,12 @@
+// three chunky dots hop up one after another in a wave, stretching as they fly and squashing as they land
+const{sin,cos,PI,max,abs}=Math,T=2*PI
+export const frames=20,delay=60
+export default(c,t)=>{
+  for(let k=0;k<3;k++){
+    const x=54+k*74,u=((t-k*.13)%1+1)%1,h=u<.5?sin(T*u):0,v=u<.5?abs(sin(2*T*u)):0,q=u>.5&&u<.62?sin(PI*(u-.5)/.12):0
+    const sx=1-.05*v+.16*q,sy=1+.07*v-.18*q,r=31,y=196-80*h
+    c.fillStyle='#bbb';c.beginPath();c.ellipse(x,200,24*(1-.45*h)*sx,5*(1-.4*h),0,0,T);c.fill()
+    c.fillStyle='#fff';c.save();c.translate(x,y);c.scale(sx,sy)
+    c.lineWidth=7/((sx+sy)/2);c.beginPath();c.arc(0,-r,r,0,T);c.fill();c.stroke();c.restore()
+  }
+}