feat: add email verification, profile pictures, deposits, and calendar

export
Backend:
- Add email verification code generation and verification endpoints
- Add profile picture upload with S3 storage and image processing
- Add deposit_required field to users with 48h advance booking
  requirement
- Add loyalty stamps that accumulate on completed bookings
- Auto-transition bookings: confirmed → in_progress → completed
- Add booking cancellation handler with no-show detection
- Add ICS calendar file download endpoint for bookings
- Sync bookings to CalDAV on confirmation
  Frontend:
- Add schedule page route
- Add avatar and image-cropper UI components
- Update shadcn-svelte components (button, dialog)
- Add "Add to Calendar" button in booking modal
  Database:
- Add verification_codes table
- Add profile_pic_url, loyalty_stamps, deposits_required to users
- Various schema updates

frontend/src/lib/utils.ts

@@ -1,13 +1,13 @@
-import { clsx, type ClassValue } from "clsx";
-import { twMerge } from "tailwind-merge";
+import { type ClassValue, clsx } from 'clsx';
+import { twMerge } from 'tailwind-merge';
 
 export function cn(...inputs: ClassValue[]) {
 	return twMerge(clsx(inputs));
 }
 
 // eslint-disable-next-line @typescript-eslint/no-explicit-any
-export type WithoutChild<T> = T extends { child?: any } ? Omit<T, "child"> : T;
+export type WithoutChild<T> = T extends { child?: any } ? Omit<T, 'child'> : T;
 // eslint-disable-next-line @typescript-eslint/no-explicit-any
-export type WithoutChildren<T> = T extends { children?: any } ? Omit<T, "children"> : T;
+export type WithoutChildren<T> = T extends { children?: any } ? Omit<T, 'children'> : T;
 export type WithoutChildrenOrChild<T> = WithoutChildren<WithoutChild<T>>;
 export type WithElementRef<T, U extends HTMLElement = HTMLElement> = T & { ref?: U | null };