feat(ux): prevent wizard close on backdrop click

AnimatedModal: add disableBackdropClose prop (default false, no impact
on existing consumers). When true, overlay onClick is removed.

ProjectWizard: remove handleBackdropClick — backdrop click no longer
closes the wizard. Only the X button and Cancel close it.

EstimateWizard already had no backdrop-click handler; no change needed.

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

apps/web/src/components/ui/AnimatedModal.tsx

@@ -10,6 +10,7 @@ interface AnimatedModalProps {
   className?: string;
   overlayClassName?: string;
   maxWidth?: string;
+  disableBackdropClose?: boolean;
 }
 
 export function AnimatedModal({
@@ -19,6 +20,7 @@ export function AnimatedModal({
   className,
   overlayClassName,
   maxWidth = "max-w-xl",
+  disableBackdropClose = false,
 }: AnimatedModalProps) {
   const panelRef = useRef<HTMLDivElement>(null);
 
@@ -49,7 +51,7 @@ export function AnimatedModal({
               overlayClassName ??
               "absolute inset-0 bg-black/40 backdrop-blur-sm"
             }
-            onClick={onClose}
+            onClick={disableBackdropClose ? undefined : onClose}
             aria-hidden="true"
           />