Add more floating school emoji to student login background

Doubles the decoration count to 20 items: scissors, open book, trophy, crayon, triangle ruler, lightbulb, backpack, microscope, straight ruler, globe, bell, paintbrush join the existing stars, books, pencil, rainbow, palette, and notepad.

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

public/index.html

@@ -18,6 +18,18 @@
     <span style="left:93%;top:44%;animation-duration:3.5s;animation-delay:3.1s">⭐</span>
     <span style="left:2%;top:52%;animation-duration:4.9s;animation-delay:0.3s">🌟</span>
     <span style="left:60%;top:90%;animation-duration:4.4s;animation-delay:2.7s">📝</span>
+    <span style="left:38%;top:8%;animation-duration:4.6s;animation-delay:0.9s">✂️</span>
+    <span style="left:6%;top:30%;animation-duration:5.3s;animation-delay:1.6s">📖</span>
+    <span style="left:85%;top:33%;animation-duration:4.0s;animation-delay:2.4s">🏆</span>
+    <span style="left:71%;top:18%;animation-duration:5.8s;animation-delay:0.4s">🖍️</span>
+    <span style="left:22%;top:60%;animation-duration:3.9s;animation-delay:3.3s">📐</span>
+    <span style="left:50%;top:95%;animation-duration:4.8s;animation-delay:1.1s">💡</span>
+    <span style="left:63%;top:63%;animation-duration:5.2s;animation-delay:2.0s">🎒</span>
+    <span style="left:30%;top:88%;animation-duration:4.3s;animation-delay:0.7s">🔬</span>
+    <span style="left:91%;top:82%;animation-duration:3.6s;animation-delay:1.8s">📏</span>
+    <span style="left:8%;top:90%;animation-duration:5.0s;animation-delay:2.9s">🌍</span>
+    <span style="left:77%;top:50%;animation-duration:4.5s;animation-delay:0.2s">🔔</span>
+    <span style="left:42%;top:75%;animation-duration:5.6s;animation-delay:3.5s">🖌️</span>
   </div>
 
   <!-- Kid picker -->