feat(ui): Components refactoring with Tailwind - UI kit, icons, lazy loading images

- Created reusable UI components (Card, Button, Badge, Form, Icon)
- Added PageIcon and NavIcon components with consistent styling
- Refactored all pages to use new UI components
- Added non-blocking image loading with skeleton for book covers
- Created LibraryActions dropdown for library settings
- Added emojis to buttons for better UX
- Fixed Client Component issues with getBookCoverUrl

apps/backoffice/app/components/ui/index.ts

@@ -0,0 +1,8 @@
+export { Card, CardHeader } from "./Card";
+export { Badge, StatusBadge, JobTypeBadge } from "./Badge";
+export { StatBox } from "./StatBox";
+export { ProgressBar, MiniProgressBar } from "./ProgressBar";
+export { Button } from "./Button";
+export { Input, Select } from "./Input";
+export { FormField, FormLabel, FormInput, FormSelect, FormRow } from "./Form";
+export { PageIcon, NavIcon } from "./Icon";