feat(timeline): add pulse animation for in-flight drag mutations

Allocation bars that have active optimistic overrides (post-drag,
awaiting server confirmation) now pulse subtly via animate-pulse.
The pending set is derived from the existing optimisticAllocations
map keys, requiring no additional state.

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

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

@@ -2,6 +2,7 @@
 
 import { motion, AnimatePresence } from "framer-motion";
 import { useEffect, useCallback, useRef, type ReactNode } from "react";
+import { useFocusTrap } from "~/hooks/useFocusTrap.js";
 
 interface AnimatedModalProps {
   open: boolean;
@@ -24,6 +25,8 @@ export function AnimatedModal({
 }: AnimatedModalProps) {
   const panelRef = useRef<HTMLDivElement>(null);
 
+  useFocusTrap(panelRef, open);
+
   const handleEscape = useCallback(
     (e: KeyboardEvent) => {
       if (e.key === "Escape") onClose();