refactor: inline single-use components, remove dead code

- Inline TopBar into root layout (+layout.svelte) — only used there
- Inline Center into home page (+page.svelte) — only used there
- Remove ComboBox.svelte — dead code, no imports
- Remove TipTap.svelte — dead code, no imports
- Remove empty container/ui/admin/tiptap directories
- Keep Window.svelte in components/containers/ — used by 4 pages

src/lib/components/admin/ComboBox.svelte

@@ -1,160 +0,0 @@
-<script lang="ts">
-	type Option = { label: string; value: string | number };
-
-	type Props = {
-		id: string;
-		name: string;
-		options: Option[];
-		placeholder?: string;
-		value?: string | number;
-	};
-
-	let { id, name, options, placeholder = 'Search...', value }: Props = $props();
-
-	let search = $state('');
-	let open = $state(false);
-	let highlightIndex = $state(-1);
-	let inputEl = $state<HTMLInputElement | null>(null);
-	let listEl = $state<HTMLUListElement | null>(null);
-
-	let selectedValue = $state<string | number | undefined>(undefined);
-
-	$effect(() => {
-		if (value != null && value !== '') {
-			selectedValue = value;
-		}
-	});
-
-	let selectedLabel = $derived(() => {
-		if (selectedValue == null || selectedValue === '') return '';
-		const match = options.find((o) => String(o.value) === String(selectedValue));
-		return match?.label ?? '';
-	});
-
-	let filtered = $derived(() => {
-		if (!search) return options;
-		const q = search.toLowerCase();
-		return options.filter((o) => o.label.toLowerCase().includes(q));
-	});
-
-	function select(opt: Option) {
-		selectedValue = opt.value;
-		search = '';
-		open = false;
-		highlightIndex = -1;
-	}
-
-	function clear() {
-		selectedValue = undefined;
-		search = '';
-		open = true;
-		inputEl?.focus();
-	}
-
-	function handleInputFocus() {
-		open = true;
-		highlightIndex = -1;
-	}
-
-	function handleInputBlur(e: FocusEvent) {
-		const related = e.relatedTarget as HTMLElement | null;
-		if (related?.closest(`[data-combobox="${id}"]`)) return;
-		open = false;
-		highlightIndex = -1;
-	}
-
-	function handleKeydown(e: KeyboardEvent) {
-		const items = filtered();
-		if (e.key === 'ArrowDown') {
-			e.preventDefault();
-			open = true;
-			highlightIndex = Math.min(highlightIndex + 1, items.length - 1);
-			scrollToHighlighted();
-		} else if (e.key === 'ArrowUp') {
-			e.preventDefault();
-			highlightIndex = Math.max(highlightIndex - 1, 0);
-			scrollToHighlighted();
-		} else if (e.key === 'Enter') {
-			e.preventDefault();
-			if (open && highlightIndex >= 0 && highlightIndex < items.length) {
-				select(items[highlightIndex]);
-			}
-		} else if (e.key === 'Escape') {
-			open = false;
-			search = '';
-			highlightIndex = -1;
-		}
-	}
-
-	function scrollToHighlighted() {
-		requestAnimationFrame(() => {
-			const el = listEl?.children[highlightIndex] as HTMLElement | undefined;
-			el?.scrollIntoView({ block: 'nearest' });
-		});
-	}
-</script>
-
-<div class="relative" data-combobox={id}>
-	<input type="hidden" {name} value={selectedValue ?? ''} />
-	<input type="hidden" name={name + 'Label'} value={selectedValue != null && selectedValue !== '' ? selectedLabel() : search} />
-
-	{#if selectedValue != null && selectedValue !== ''}
-		<div
-			class="flex w-full items-center justify-between rounded-lg border border-gray-300 bg-white px-3 py-2 transition-shadow outline-none focus-within:border-blue-500 focus-within:ring-2 focus-within:ring-blue-500"
-		>
-			<button
-				type="button"
-				class="flex-1 cursor-pointer text-left text-gray-900"
-				onclick={() => clear()}
-			>
-				{selectedLabel()}
-			</button>
-			<button
-				type="button"
-				class="ml-2 shrink-0 text-gray-400 hover:text-gray-600"
-				onclick={() => clear()}
-				tabindex={-1}
-			>
-				&#10005;
-			</button>
-		</div>
-	{:else}
-		<input
-			type="text"
-			{id}
-			bind:this={inputEl}
-			bind:value={search}
-			{placeholder}
-			autocomplete="off"
-			class="w-full rounded-lg border border-gray-300 bg-white px-3 py-2 transition-shadow outline-none focus:border-blue-500 focus:ring-2 focus:ring-blue-500"
-			onfocus={handleInputFocus}
-			onblur={handleInputBlur}
-			onkeydown={handleKeydown}
-		/>
-	{/if}
-
-	{#if open}
-		<ul
-			bind:this={listEl}
-			class="absolute z-50 mt-1 max-h-60 w-full overflow-auto rounded-lg border border-gray-200 bg-white py-1 shadow-lg"
-			role="listbox"
-		>
-			{#each filtered() as opt, i}
-				<li role="option" aria-selected={highlightIndex === i}>
-					<button
-						type="button"
-						class="w-full px-3 py-2 text-left text-sm {highlightIndex === i
-							? 'bg-blue-50 text-blue-700'
-							: 'text-gray-700 hover:bg-gray-50'}"
-						onmousedown={(e: MouseEvent) => { e.preventDefault(); select(opt); }}
-						onmouseenter={() => (highlightIndex = i)}
-					>
-						{opt.label}
-					</button>
-				</li>
-			{:else}
-				<li class="px-3 py-2 text-sm text-gray-400">No matches</li>
-			{/each}
-		</ul>
-	{/if}
-</div>