feat: Sprint 3 — delight, polish, and responsive sidebar

Celebration micro-interactions:
- SuccessToast: auto-dismissing pill toast (success/info/warning variants)
- ConfettiBurst: pure CSS 20-particle confetti on project creation
- Project wizard: confetti + toast on successful creation
- Vacation approval/rejection: contextual toasts
- Allocation status change: success toast
- Button: active:scale-[0.97] press feedback on all variants

Collapsible sidebar + responsive:
- Desktop: toggle collapse (72px icons-only mode) with localStorage persistence
- NavTooltip: hover labels on collapsed icons
- Mobile: hamburger menu + slide-in overlay with backdrop
- Auto-close sidebar on mobile navigation
- Scroll-to-top on route change (smooth behavior)

Hover polish + accessibility:
- Table rows: animated left-border accent + hover-lift
- Stat cards + widgets: hover elevation + border glow
- Timeline blocks: scale(1.02) + shadow-md on hover
- Smooth scroll globally with prefers-reduced-motion fallback
- Filter chips: framer-motion scale+fade enter/exit
- Dropdowns: scaleY origin-top reveal animation
- Preferences modal: scale+fade entrance
- Link underline: animated ::after width expansion on hover

Co-Authored-By: claude-flow <ruv@ruv.net>

apps/web/src/app/(app)/resources/ResourcesClient.tsx

@@ -1114,7 +1114,7 @@ export function ResourcesClient() {
                       id={resource.id}
                       dragRef={rowDragRef}
                       onDrop={(draggedId) => reorder(draggedId, resource.id)}
-                      className={`transition-colors hover:bg-gray-50/80 dark:hover:bg-gray-900/60 animate-row-enter ${isSelected ? "bg-brand-50 dark:bg-brand-900/20" : ""}`}
+                      className={`table-row-hover hover-lift hover:bg-gray-50/80 dark:hover:bg-gray-900/60 animate-row-enter ${isSelected ? "bg-brand-50 dark:bg-brand-900/20" : ""}`}
                       style={{ animationDelay: `${Math.min(index * 15, 300)}ms` }}
                     >
                       <td className="px-4 py-3">
@@ -1386,7 +1386,7 @@ export function ResourcesClient() {
                           onClick={() =>
                             setModal({ type: "edit", resource: resource as unknown as Resource })
                           }
-                          className="mr-3 text-xs font-medium text-brand-600 transition-colors hover:text-brand-800 dark:text-brand-300 dark:hover:text-brand-100"
+                          className="link-hover-underline mr-3 text-xs font-medium text-brand-600 transition-colors hover:text-brand-800 dark:text-brand-300 dark:hover:text-brand-100"
                         >
                           Edit
                         </button>