refactor: create shared UI components and utilities

- Add Select UI component
- Create currency utilities (CURRENCIES, formatPrice)
- Create ThemedCard wrapper component
- Create FormField wrapper component
- Update ItemForm and WishlistItem to use new abstractions
- Standardize currency type with single source of truth

src/lib/components/ui/FormField.svelte

@@ -0,0 +1,35 @@
+<script lang="ts">
+  import { Label } from '$lib/components/ui/label';
+  import type { Snippet } from 'svelte';
+
+  interface Props {
+    id: string;
+    label: string;
+    required?: boolean;
+    children: Snippet;
+    class?: string;
+    description?: string;
+  }
+
+  let {
+    id,
+    label,
+    required = false,
+    children,
+    class: className = '',
+    description
+  }: Props = $props();
+</script>
+
+<div class="space-y-2 {className}">
+  <Label for={id}>
+    {label}
+    {#if required}
+      <span class="text-muted-foreground">(required)</span>
+    {/if}
+  </Label>
+  {#if description}
+    <p class="text-sm text-muted-foreground">{description}</p>
+  {/if}
+  {@render children()}
+</div>

src/lib/components/ui/ThemedCard.svelte

@@ -0,0 +1,54 @@
+<script lang="ts">
+  import { Card, CardContent, CardHeader, CardTitle, CardDescription } from '$lib/components/ui/card';
+  import ThemeCard from '$lib/components/themes/ThemeCard.svelte';
+  import { getCardStyle } from '$lib/utils/colors';
+
+  interface Props {
+    color?: string | null;
+    fallbackColor?: string | null;
+    theme?: string | null;
+    showPattern?: boolean;
+    title?: string;
+    description?: string;
+    children?: import('svelte').Snippet;
+    class?: string;
+    padding?: 'none' | 'normal' | 'large';
+  }
+
+  let {
+    color = null,
+    fallbackColor = null,
+    theme = null,
+    showPattern = false,
+    title,
+    description,
+    children,
+    class: className = '',
+    padding = 'normal'
+  }: Props = $props();
+
+  const cardStyle = $derived(getCardStyle(color, fallbackColor));
+  
+  const paddingClasses = {
+    none: 'p-0',
+    normal: 'p-6',
+    large: 'p-12'
+  };
+</script>
+
+<Card style={cardStyle} class="relative overflow-hidden {className}">
+  <ThemeCard themeName={theme} {color} {showPattern} />
+  
+  {#if title}
+    <CardHeader class="relative z-10">
+      <CardTitle>{title}</CardTitle>
+      {#if description}
+        <CardDescription>{description}</CardDescription>
+      {/if}
+    </CardHeader>
+  {/if}
+  
+  <CardContent class="{paddingClasses[padding]} relative z-10">
+    {@render children?.()}
+  </CardContent>
+</Card>

src/lib/components/ui/select/index.ts

@@ -0,0 +1,6 @@
+import Root from './select.svelte';
+
+export {
+  Root,
+  Root as Select
+};

src/lib/components/ui/select/select.svelte

@@ -0,0 +1,22 @@
+<script lang="ts">
+  import { cn } from '$lib/utils';
+  import type { HTMLSelectAttributes } from 'svelte/elements';
+
+  type Props = HTMLSelectAttributes & {
+    value?: string;
+    children?: import('svelte').Snippet;
+  };
+
+  let { class: className, value = $bindable(''), children, ...restProps }: Props = $props();
+</script>
+
+<select
+  class={cn(
+    'flex h-9 w-full rounded-md border border-input bg-transparent px-3 py-1 text-sm shadow-sm transition-colors focus-visible:outline-none focus-visible:ring-1 focus-visible:ring-ring disabled:cursor-not-allowed disabled:opacity-50',
+    className
+  )}
+  bind:value
+  {...restProps}
+>
+  {@render children?.()}
+</select>

src/lib/components/wishlist/ItemForm.svelte

@@ -3,14 +3,14 @@
   import { Input } from '$lib/components/ui/input';
   import { Label } from '$lib/components/ui/label';
   import { Textarea } from '$lib/components/ui/textarea';
-  import { Card, CardContent, CardHeader, CardTitle } from '$lib/components/ui/card';
+  import { Select } from '$lib/components/ui/select';
+  import ThemedCard from '$lib/components/ui/ThemedCard.svelte';
   import ImageSelector from './ImageSelector.svelte';
   import ColorPicker from '$lib/components/ui/ColorPicker.svelte';
   import { enhance } from '$app/forms';
   import type { Item } from '$lib/db/schema';
   import { languageStore } from '$lib/stores/language.svelte';
-  import ThemeCard from '$lib/components/themes/ThemeCard.svelte';
-  import { getCardStyle } from '$lib/utils/colors';
+  import { CURRENCIES } from '$lib/utils/currency';
   import { createEventDispatcher } from 'svelte';
 
   const dispatch = createEventDispatcher<{
@@ -37,9 +37,7 @@
   }: Props = $props();
 
   const isEdit = mode === 'edit' && item !== null;
-  const cardStyle = $derived(getCardStyle(wishlistColor, null));
   const t = $derived(languageStore.t);
-  const currencies = ['DKK', 'EUR', 'USD', 'SEK', 'NOK', 'GBP'];
 
   // Form state - initialized from item if editing
   let linkUrl = $state(item?.link || '');
@@ -114,12 +112,7 @@
   });
 </script>
 
-<Card style={cardStyle} class="relative overflow-hidden">
-  <ThemeCard themeName={wishlistTheme} color={wishlistColor} showPattern={false} />
-  <CardHeader class="relative z-10">
-    <CardTitle>{titleLabel}</CardTitle>
-  </CardHeader>
-  <CardContent class="relative z-10">
+<ThemedCard theme={wishlistTheme} color={wishlistColor} title={titleLabel}>
     <form
       method="POST"
       action={formAction}
@@ -201,17 +194,11 @@
 
         <div class="space-y-2 md:col-span-2">
           <Label for="currency">{t.form.currency}</Label>
-          <select
-            id="currency"
-            name="currency"
-            class="flex h-9 w-full rounded-md border border-input bg-transparent px-3 py-1 text-sm shadow-sm"
-          >
-            {#each currencies as curr (curr)}
-              <option value={curr} selected={curr === (item?.currency || 'DKK')}>
-                {curr}
-              </option>
+          <Select id="currency" name="currency" value={item?.currency || 'DKK'}>
+            {#each CURRENCIES as curr (curr)}
+              <option value={curr}>{curr}</option>
             {/each}
-          </select>
+          </Select>
         </div>
 
         <div class="md:col-span-2">
@@ -251,5 +238,4 @@
         {/if}
       </div>
     </form>
-  </CardContent>
-</Card>
+  </ThemedCard>

src/lib/components/wishlist/WishlistItem.svelte

@@ -1,11 +1,10 @@
 <script lang="ts">
-  import { Card, CardContent } from '$lib/components/ui/card';
+  import ThemedCard from '$lib/components/ui/ThemedCard.svelte';
   import type { Item } from '$lib/db/schema';
   import { GripVertical, ExternalLink } from '@lucide/svelte';
-  import { getCardStyle } from '$lib/utils/colors';
   import { Button } from '$lib/components/ui/button';
   import { languageStore } from '$lib/stores/language.svelte';
-  import ThemeCard from '$lib/components/themes/ThemeCard.svelte';
+  import { formatPrice } from '$lib/utils/currency';
 
   interface Props {
     item: Item;
@@ -26,36 +25,9 @@
   }: Props = $props();
 
   const t = $derived(languageStore.t);
-
-  const currencySymbols: Record<string, string> = {
-    DKK: 'kr',
-    EUR: '€',
-    USD: '$',
-    SEK: 'kr',
-    NOK: 'kr',
-    GBP: '£'
-  };
-
-  function formatPrice(price: string | null, currency: string | null): string {
-    if (!price) return '';
-    const symbol = currency ? currencySymbols[currency] || currency : 'kr';
-    const amount = parseFloat(price).toFixed(2);
-
-    // For Danish, Swedish, Norwegian kroner, put symbol after the amount
-    if (currency && ['DKK', 'SEK', 'NOK'].includes(currency)) {
-      return `${amount} ${symbol}`;
-    }
-
-    // For other currencies, put symbol before
-    return `${symbol}${amount}`;
-  }
-
-  const cardStyle = $derived(getCardStyle(item.color, wishlistColor));
 </script>
 
-<Card style={cardStyle} class="relative overflow-hidden">
-  <ThemeCard themeName={theme} color={item.color} showPattern={false} />
-  <CardContent class="p-6 relative z-10">
+<ThemedCard color={item.color} fallbackColor={wishlistColor} theme={theme} padding="none">
     <div class="flex gap-4">
       {#if showDragHandle}
         <div
@@ -121,5 +93,4 @@
         </div>
       </div>
     </div>
-  </CardContent>
-</Card>
+  </ThemedCard>

src/lib/server/validation.ts

@@ -93,8 +93,9 @@ export function sanitizeToken(token: string | null | undefined): string {
 
 // Zod schemas for type-safe form validation
 import { z } from 'zod';
+import { CURRENCIES } from '$lib/utils/currency';
 
-export const currencySchema = z.enum(['DKK', 'EUR', 'USD', 'SEK', 'NOK', 'GBP']);
+export const currencySchema = z.enum(CURRENCIES);
 
 export const itemSchema = z.object({
   title: z.string().min(1, 'Title is required').max(255),

src/lib/utils/currency.ts

@@ -0,0 +1,41 @@
+/**
+ * Currency utilities for formatting and displaying prices
+ */
+
+export const CURRENCIES = ['DKK', 'EUR', 'USD', 'SEK', 'NOK', 'GBP'] as const;
+
+export type Currency = (typeof CURRENCIES)[number];
+
+export const currencySymbols: Record<Currency, string> = {
+  DKK: 'kr',
+  EUR: '€',
+  USD: '$',
+  SEK: 'kr',
+  NOK: 'kr',
+  GBP: '£'
+};
+
+/**
+ * Check if a currency symbol should be placed after the amount
+ */
+export function isPostfixCurrency(currency: Currency): boolean {
+  return ['DKK', 'SEK', 'NOK'].includes(currency);
+}
+
+/**
+ * Format a price with the appropriate currency symbol
+ */
+export function formatPrice(price: string | number | null, currency: Currency | null): string {
+  if (!price) return '';
+  
+  const symbol = currency ? currencySymbols[currency] || currency : 'kr';
+  const amount = typeof price === 'string' ? parseFloat(price).toFixed(2) : price.toFixed(2);
+
+  // For Danish, Swedish, Norwegian kroner, put symbol after the amount
+  if (currency && isPostfixCurrency(currency)) {
+    return `${amount} ${symbol}`;
+  }
+
+  // For other currencies, put symbol before
+  return `${symbol}${amount}`;
+}