Improve capacity matrix performance with lazy loading and better UX

- Add beautiful skeleton loading placeholders for initial page load
- Add individual cell skeletons during data refresh
- Create click-to-manage dialog for easy schedule adjustment per day
- Add day navigation (prev/next) within the schedule dialog
- Memoize components and data lookups for better performance
- Replace full page reload with React Query cache invalidation
- Add staleTime to queries for better caching
- Use conditional query fetching (operations only loaded as fallback)
- Add hover effects and click hints for better UX

Author: claude

src/components/capacity/CapacityMatrixSkeleton.tsx

@@ -0,0 +1,103 @@
+import { Skeleton } from "@/components/ui/skeleton";
+import { Card, CardContent, CardHeader } from "@/components/ui/card";
+
+interface CapacityMatrixSkeletonProps {
+  rowCount?: number;
+  columnCount?: number;
+}
+
+export function CapacityMatrixSkeleton({
+  rowCount = 6,
+  columnCount = 14
+}: CapacityMatrixSkeletonProps) {
+  return (
+    <div className="p-6 space-y-6">
+      {/* Header skeleton */}
+      <div className="flex flex-col sm:flex-row justify-between items-start sm:items-center gap-4">
+        <div className="space-y-2">
+          <Skeleton className="h-9 w-48" />
+          <Skeleton className="h-5 w-72" />
+        </div>
+        <div className="flex items-center gap-4">
+          <Skeleton className="h-10 w-32" />
+          <div className="flex items-center gap-2">
+            <Skeleton className="h-10 w-10" />
+            <Skeleton className="h-6 w-44" />
+            <Skeleton className="h-10 w-10" />
+          </div>
+        </div>
+      </div>
+
+      {/* Legend skeleton */}
+      <div className="flex flex-wrap gap-2">
+        {[1, 2, 3, 4, 5].map((i) => (
+          <Skeleton key={i} className="h-6 w-24" />
+        ))}
+      </div>
+
+      {/* Table skeleton */}
+      <Card>
+        <CardHeader className="pb-2">
+          <Skeleton className="h-6 w-44" />
+          <Skeleton className="h-4 w-64 mt-1" />
+        </CardHeader>
+        <CardContent className="overflow-x-auto">
+          <div className="w-full">
+            {/* Header row */}
+            <div className="flex border-b pb-2 mb-2">
+              <div className="min-w-[150px] p-2">
+                <Skeleton className="h-5 w-12" />
+              </div>
+              {Array.from({ length: columnCount }).map((_, i) => (
+                <div key={i} className="min-w-[80px] p-2 text-center">
+                  <Skeleton className="h-4 w-8 mx-auto mb-1" />
+                  <Skeleton className="h-5 w-5 mx-auto" />
+                </div>
+              ))}
+            </div>
+
+            {/* Body rows */}
+            {Array.from({ length: rowCount }).map((_, rowIndex) => (
+              <div
+                key={rowIndex}
+                className="flex border-b py-1"
+                style={{
+                  animationDelay: `${rowIndex * 100}ms`,
+                  opacity: 1 - (rowIndex * 0.1)
+                }}
+              >
+                <div className="min-w-[150px] p-3">
+                  <div className="flex items-center gap-2">
+                    <Skeleton className="w-3 h-3 rounded-full" />
+                    <Skeleton className="h-5 w-20" />
+                  </div>
+                  <Skeleton className="h-3 w-24 mt-1 ml-5" />
+                </div>
+                {Array.from({ length: columnCount }).map((_, colIndex) => (
+                  <div key={colIndex} className="min-w-[80px] p-1">
+                    <Skeleton
+                      className="h-12 w-full rounded-md"
+                      style={{
+                        animationDelay: `${(rowIndex * columnCount + colIndex) * 20}ms`
+                      }}
+                    />
+                  </div>
+                ))}
+              </div>
+            ))}
+          </div>
+        </CardContent>
+      </Card>
+    </div>
+  );
+}
+
+// Inline skeleton for individual cells when updating
+export function CellSkeleton() {
+  return (
+    <div className="rounded-md p-2 bg-muted animate-pulse">
+      <Skeleton className="h-4 w-8 mx-auto mb-1" />
+      <Skeleton className="h-3 w-12 mx-auto" />
+    </div>
+  );
+}