improvement: fdi tooth chart selection modes polished. bugs related to teeth selecyion fixed.

frontend/src/styles/globals.css

@@ -354,6 +354,12 @@ select option {
   stroke: currentColor;
 }
 
+/* Opt out when an icon sits on a primary/filled control (Send, etc.) */
+.lucide.lucide-on-primary {
+  color: #fff;
+  stroke: currentColor;
+}
+
 @keyframes task-row-complete-exit {
   0% {
     opacity: 1;