feat: Implement reference data management for states, transport modes, transport types, and valuation methods

- Added server-side loading logic for states, transport modes, transport types, and valuation methods with pagination support.
- Created Svelte components for displaying and managing states, transport modes, transport types, and valuation methods.
- Implemented infinite scroll functionality for loading more data as the user scrolls.
- Added error handling and user feedback for API interactions.
- Included dialogs for creating and editing entries in each reference data category.

frontend/src/lib/components/ui/badge/badge.svelte

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+<script lang="ts" module>
+	import { type VariantProps, tv } from "tailwind-variants";
+
+	export const badgeVariants = tv({
+		base: "focus-visible:border-ring focus-visible:ring-ring/50 aria-invalid:ring-destructive/20 dark:aria-invalid:ring-destructive/40 aria-invalid:border-destructive inline-flex w-fit shrink-0 items-center justify-center gap-1 overflow-hidden whitespace-nowrap rounded-full border px-2 py-0.5 text-xs font-medium transition-[color,box-shadow] focus-visible:ring-[3px] [&>svg]:pointer-events-none [&>svg]:size-3",
+		variants: {
+			variant: {
+				default:
+					"bg-primary text-primary-foreground [a&]:hover:bg-primary/90 border-transparent",
+				secondary:
+					"bg-secondary text-secondary-foreground [a&]:hover:bg-secondary/90 border-transparent",
+				destructive:
+					"bg-destructive [a&]:hover:bg-destructive/90 focus-visible:ring-destructive/20 dark:focus-visible:ring-destructive/40 dark:bg-destructive/70 border-transparent text-white",
+				outline: "text-foreground [a&]:hover:bg-accent [a&]:hover:text-accent-foreground",
+			},
+		},
+		defaultVariants: {
+			variant: "default",
+		},
+	});
+
+	export type BadgeVariant = VariantProps<typeof badgeVariants>["variant"];
+</script>
+
+<script lang="ts">
+	import type { HTMLAnchorAttributes } from "svelte/elements";
+	import { cn, type WithElementRef } from "$lib/utils.js";
+
+	let {
+		ref = $bindable(null),
+		href,
+		class: className,
+		variant = "default",
+		children,
+		...restProps
+	}: WithElementRef<HTMLAnchorAttributes> & {
+		variant?: BadgeVariant;
+	} = $props();
+</script>
+
+<svelte:element
+	this={href ? "a" : "span"}
+	bind:this={ref}
+	data-slot="badge"
+	{href}
+	class={cn(badgeVariants({ variant }), className)}
+	{...restProps}
+>
+	{@render children?.()}
+</svelte:element>

frontend/src/lib/components/ui/badge/index.ts

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+export { default as Badge } from "./badge.svelte";
+export { badgeVariants, type BadgeVariant } from "./badge.svelte";

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

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+import { Select as SelectPrimitive } from "bits-ui";
+
+import Group from "./select-group.svelte";
+import Label from "./select-label.svelte";
+import Item from "./select-item.svelte";
+import Content from "./select-content.svelte";
+import Trigger from "./select-trigger.svelte";
+import Separator from "./select-separator.svelte";
+import ScrollDownButton from "./select-scroll-down-button.svelte";
+import ScrollUpButton from "./select-scroll-up-button.svelte";
+import GroupHeading from "./select-group-heading.svelte";
+
+const Root = SelectPrimitive.Root;
+
+export {
+	Root,
+	Group,
+	Label,
+	Item,
+	Content,
+	Trigger,
+	Separator,
+	ScrollDownButton,
+	ScrollUpButton,
+	GroupHeading,
+	//
+	Root as Select,
+	Group as SelectGroup,
+	Label as SelectLabel,
+	Item as SelectItem,
+	Content as SelectContent,
+	Trigger as SelectTrigger,
+	Separator as SelectSeparator,
+	ScrollDownButton as SelectScrollDownButton,
+	ScrollUpButton as SelectScrollUpButton,
+	GroupHeading as SelectGroupHeading,
+};

frontend/src/lib/components/ui/select/select-content.svelte

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+<script lang="ts">
+	import { Select as SelectPrimitive } from "bits-ui";
+	import SelectScrollUpButton from "./select-scroll-up-button.svelte";
+	import SelectScrollDownButton from "./select-scroll-down-button.svelte";
+	import { cn, type WithoutChild } from "$lib/utils.js";
+
+	let {
+		ref = $bindable(null),
+		class: className,
+		sideOffset = 4,
+		portalProps,
+		children,
+		...restProps
+	}: WithoutChild<SelectPrimitive.ContentProps> & {
+		portalProps?: SelectPrimitive.PortalProps;
+	} = $props();
+</script>
+
+<SelectPrimitive.Portal {...portalProps}>
+	<SelectPrimitive.Content
+		bind:ref
+		{sideOffset}
+		data-slot="select-content"
+		class={cn(
+			"bg-popover text-popover-foreground data-[state=open]:animate-in data-[state=closed]:animate-out data-[state=closed]:fade-out-0 data-[state=open]:fade-in-0 data-[state=closed]:zoom-out-95 data-[state=open]:zoom-in-95 data-[side=bottom]:slide-in-from-top-2 data-[side=left]:slide-in-from-right-2 data-[side=right]:slide-in-from-left-2 data-[side=top]:slide-in-from-bottom-2 max-h-(--bits-select-content-available-height) origin-(--bits-select-content-transform-origin) relative z-50 min-w-[8rem] overflow-y-auto overflow-x-hidden rounded-md border shadow-md data-[side=bottom]:translate-y-1 data-[side=left]:-translate-x-1 data-[side=right]:translate-x-1 data-[side=top]:-translate-y-1",
+			className
+		)}
+		{...restProps}
+	>
+		<SelectScrollUpButton />
+		<SelectPrimitive.Viewport
+			class={cn(
+				"h-(--bits-select-anchor-height) min-w-(--bits-select-anchor-width) w-full scroll-my-1 p-1"
+			)}
+		>
+			{@render children?.()}
+		</SelectPrimitive.Viewport>
+		<SelectScrollDownButton />
+	</SelectPrimitive.Content>
+</SelectPrimitive.Portal>

frontend/src/lib/components/ui/select/select-group-heading.svelte

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+<script lang="ts">
+	import { Select as SelectPrimitive } from "bits-ui";
+	import { cn } from "$lib/utils.js";
+	import type { ComponentProps } from "svelte";
+
+	let {
+		ref = $bindable(null),
+		class: className,
+		children,
+		...restProps
+	}: ComponentProps<typeof SelectPrimitive.GroupHeading> = $props();
+</script>
+
+<SelectPrimitive.GroupHeading
+	bind:ref
+	data-slot="select-group-heading"
+	class={cn("text-muted-foreground px-2 py-1.5 text-xs", className)}
+	{...restProps}
+>
+	{@render children?.()}
+</SelectPrimitive.GroupHeading>

frontend/src/lib/components/ui/select/select-group.svelte

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+<script lang="ts">
+	import { Select as SelectPrimitive } from "bits-ui";
+
+	let { ref = $bindable(null), ...restProps }: SelectPrimitive.GroupProps = $props();
+</script>
+
+<SelectPrimitive.Group data-slot="select-group" {...restProps} />

frontend/src/lib/components/ui/select/select-item.svelte

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+<script lang="ts">
+	import CheckIcon from "@lucide/svelte/icons/check";
+	import { Select as SelectPrimitive } from "bits-ui";
+	import { cn, type WithoutChild } from "$lib/utils.js";
+
+	let {
+		ref = $bindable(null),
+		class: className,
+		value,
+		label,
+		children: childrenProp,
+		...restProps
+	}: WithoutChild<SelectPrimitive.ItemProps> = $props();
+</script>
+
+<SelectPrimitive.Item
+	bind:ref
+	{value}
+	data-slot="select-item"
+	class={cn(
+		"data-[highlighted]:bg-accent data-[highlighted]:text-accent-foreground [&_svg:not([class*='text-'])]:text-muted-foreground outline-hidden *:[span]:last:flex *:[span]:last:items-center *:[span]:last:gap-2 relative flex w-full cursor-default select-none items-center gap-2 rounded-sm py-1.5 pl-2 pr-8 text-sm data-[disabled]:pointer-events-none data-[disabled]:opacity-50 [&_svg:not([class*='size-'])]:size-4 [&_svg]:pointer-events-none [&_svg]:shrink-0",
+		className
+	)}
+	{...restProps}
+>
+	{#snippet children({ selected, highlighted })}
+		<span class="absolute right-2 flex size-3.5 items-center justify-center">
+			{#if selected}
+				<CheckIcon class="size-4" />
+			{/if}
+		</span>
+		{#if childrenProp}
+			{@render childrenProp({ selected, highlighted })}
+		{:else}
+			{label || value}
+		{/if}
+	{/snippet}
+</SelectPrimitive.Item>

frontend/src/lib/components/ui/select/select-label.svelte

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+<script lang="ts">
+	import { cn, type WithElementRef } from "$lib/utils.js";
+	import type { HTMLAttributes } from "svelte/elements";
+
+	let {
+		ref = $bindable(null),
+		class: className,
+		children,
+		...restProps
+	}: WithElementRef<HTMLAttributes<HTMLDivElement>> & {} = $props();
+</script>
+
+<div
+	bind:this={ref}
+	data-slot="select-label"
+	class={cn("text-muted-foreground px-2 py-1.5 text-xs", className)}
+	{...restProps}
+>
+	{@render children?.()}
+</div>

frontend/src/lib/components/ui/select/select-scroll-down-button.svelte

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+<script lang="ts">
+	import ChevronDownIcon from "@lucide/svelte/icons/chevron-down";
+	import { Select as SelectPrimitive } from "bits-ui";
+	import { cn, type WithoutChildrenOrChild } from "$lib/utils.js";
+
+	let {
+		ref = $bindable(null),
+		class: className,
+		...restProps
+	}: WithoutChildrenOrChild<SelectPrimitive.ScrollDownButtonProps> = $props();
+</script>
+
+<SelectPrimitive.ScrollDownButton
+	bind:ref
+	data-slot="select-scroll-down-button"
+	class={cn("flex cursor-default items-center justify-center py-1", className)}
+	{...restProps}
+>
+	<ChevronDownIcon class="size-4" />
+</SelectPrimitive.ScrollDownButton>

frontend/src/lib/components/ui/select/select-scroll-up-button.svelte

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+<script lang="ts">
+	import ChevronUpIcon from "@lucide/svelte/icons/chevron-up";
+	import { Select as SelectPrimitive } from "bits-ui";
+	import { cn, type WithoutChildrenOrChild } from "$lib/utils.js";
+
+	let {
+		ref = $bindable(null),
+		class: className,
+		...restProps
+	}: WithoutChildrenOrChild<SelectPrimitive.ScrollUpButtonProps> = $props();
+</script>
+
+<SelectPrimitive.ScrollUpButton
+	bind:ref
+	data-slot="select-scroll-up-button"
+	class={cn("flex cursor-default items-center justify-center py-1", className)}
+	{...restProps}
+>
+	<ChevronUpIcon class="size-4" />
+</SelectPrimitive.ScrollUpButton>

frontend/src/lib/components/ui/select/select-separator.svelte

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+<script lang="ts">
+	import type { Separator as SeparatorPrimitive } from "bits-ui";
+	import { Separator } from "$lib/components/ui/separator/index.js";
+	import { cn } from "$lib/utils.js";
+
+	let {
+		ref = $bindable(null),
+		class: className,
+		...restProps
+	}: SeparatorPrimitive.RootProps = $props();
+</script>
+
+<Separator
+	bind:ref
+	data-slot="select-separator"
+	class={cn("bg-border pointer-events-none -mx-1 my-1 h-px", className)}
+	{...restProps}
+/>

frontend/src/lib/components/ui/select/select-trigger.svelte

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+<script lang="ts">
+	import { Select as SelectPrimitive } from "bits-ui";
+	import ChevronDownIcon from "@lucide/svelte/icons/chevron-down";
+	import { cn, type WithoutChild } from "$lib/utils.js";
+
+	let {
+		ref = $bindable(null),
+		class: className,
+		children,
+		size = "default",
+		...restProps
+	}: WithoutChild<SelectPrimitive.TriggerProps> & {
+		size?: "sm" | "default";
+	} = $props();
+</script>
+
+<SelectPrimitive.Trigger
+	bind:ref
+	data-slot="select-trigger"
+	data-size={size}
+	class={cn(
+		"border-input data-[placeholder]:text-muted-foreground [&_svg:not([class*='text-'])]:text-muted-foreground focus-visible:border-ring focus-visible:ring-ring/50 aria-invalid:ring-destructive/20 dark:aria-invalid:ring-destructive/40 aria-invalid:border-destructive dark:bg-input/30 dark:hover:bg-input/50 shadow-xs flex w-fit select-none items-center justify-between gap-2 whitespace-nowrap rounded-md border bg-transparent px-3 py-2 text-sm outline-none transition-[color,box-shadow] focus-visible:ring-[3px] disabled:cursor-not-allowed disabled:opacity-50 data-[size=default]:h-9 data-[size=sm]:h-8 *:data-[slot=select-value]:line-clamp-1 *:data-[slot=select-value]:flex *:data-[slot=select-value]:items-center *:data-[slot=select-value]:gap-2 [&_svg:not([class*='size-'])]:size-4 [&_svg]:pointer-events-none [&_svg]:shrink-0",
+		className
+	)}
+	{...restProps}
+>
+	{@render children?.()}
+	<ChevronDownIcon class="size-4 opacity-50" />
+</SelectPrimitive.Trigger>

frontend/src/lib/components/ui/textarea/index.ts

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+import Root from "./textarea.svelte";
+
+export {
+	Root,
+	//
+	Root as Textarea,
+};

frontend/src/lib/components/ui/textarea/textarea.svelte

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+<script lang="ts">
+	import { cn, type WithElementRef, type WithoutChildren } from "$lib/utils.js";
+	import type { HTMLTextareaAttributes } from "svelte/elements";
+
+	let {
+		ref = $bindable(null),
+		value = $bindable(),
+		class: className,
+		"data-slot": dataSlot = "textarea",
+		...restProps
+	}: WithoutChildren<WithElementRef<HTMLTextareaAttributes>> = $props();
+</script>
+
+<textarea
+	bind:this={ref}
+	data-slot={dataSlot}
+	class={cn(
+		"border-input placeholder:text-muted-foreground focus-visible:border-ring focus-visible:ring-ring/50 aria-invalid:ring-destructive/20 dark:aria-invalid:ring-destructive/40 aria-invalid:border-destructive dark:bg-input/30 field-sizing-content shadow-xs flex min-h-16 w-full rounded-md border bg-transparent px-3 py-2 text-base outline-none transition-[color,box-shadow] focus-visible:ring-[3px] disabled:cursor-not-allowed disabled:opacity-50 md:text-sm",
+		className
+	)}
+	bind:value
+	{...restProps}
+></textarea>