feat: Add loading skeletons for improved UX

- Implement loading states for dashboard, project, and video views
- Introduce skeleton UIs for settings pages
- Add skeletons for Navbar and charts
- Enhance `Skeleton` component with a text variant
- Improve perceived performance during data fetching
- Update `.gitignore` with `Optimization.md`

components/ui/skeleton.tsx

@@ -0,0 +1,13 @@
+import { cn } from "@/lib/utils"
+
+function Skeleton({ className, ...props }: React.ComponentProps<"div">) {
+  return (
+    <div
+      data-slot="skeleton"
+      className={cn("bg-muted animate-pulse rounded-md", className)}
+      {...props}
+    />
+  )
+}
+
+export { Skeleton }