diff --git a/frontend/src/lib/components/ui/error-panel-notice.svelte b/frontend/src/lib/components/ui/error-panel-notice.svelte
index e69de29b..996f4db3 100644
--- a/frontend/src/lib/components/ui/error-panel-notice.svelte
+++ b/frontend/src/lib/components/ui/error-panel-notice.svelte
@@ -0,0 +1,203 @@
+<script lang="ts">
+	import { AlertCircle, AlertTriangle, ChevronDown, ChevronUp, X } from 'lucide-svelte';
+	import { cn } from '$lib/utils';
+
+	export type ErrorPanelNoticeRow = {
+		field: string;
+		message: string;
+	};
+
+	export type ErrorPanelNoticeVariant = 'error' | 'warning';
+
+	export type ErrorPanelNoticeLabels = {
+		clear: string;
+		columnType: string;
+		columnField: string;
+		columnMessage: string;
+		emptyField: string;
+		dismissRowAria: string;
+		toggleDetailsAria: string;
+	};
+
+	let {
+		open,
+		variant = 'error',
+		title,
+		rows = [],
+		durationMs = 12000,
+		labels,
+		dismissibleRows = true,
+		class: className = '',
+		onClose,
+		onDismissRow
+	}: {
+		open: boolean;
+		variant?: ErrorPanelNoticeVariant;
+		title: string;
+		rows: ErrorPanelNoticeRow[];
+		durationMs?: number;
+		labels: ErrorPanelNoticeLabels;
+		dismissibleRows?: boolean;
+		class?: string;
+		onClose?: () => void;
+		onDismissRow?: (index: number) => void;
+	} = $props();
+
+	let expanded = $state(true);
+
+	const isWarning = $derived(variant === 'warning');
+
+	/** Re-expand the table when the panel opens or when errors/warnings change (new batch). */
+	$effect(() => {
+		if (!open) return;
+		void title;
+		void variant;
+		void JSON.stringify(rows);
+		expanded = true;
+	});
+
+	$effect(() => {
+		if (!open || durationMs <= 0) return;
+		void rows.length;
+		const t = setTimeout(() => onClose?.(), durationMs);
+		return () => clearTimeout(t);
+	});
+
+	function toggleExpanded() {
+		expanded = !expanded;
+	}
+</script>
+
+{#if open}
+	<div
+		data-partida-notice-layer
+		role={isWarning ? 'status' : 'alert'}
+		class={cn(
+			// Above sonner; inset-left keeps the panel aligned with empty space in Partidas
+			'pointer-events-auto fixed top-4 left-0 z-[1000000000] flex w-[min(100vw-2rem,30rem)] max-h-[min(72vh,calc(100vh-2rem))] flex-col overflow-hidden rounded-lg border bg-background text-foreground shadow-xl sm:left-1',
+			isWarning ? 'border-amber-400/40' : 'border-border',
+			className
+		)}
+	>
+		<!-- Header -->
+		<div
+			class={cn(
+				'flex shrink-0 items-center gap-2 border-b px-3 py-2.5',
+				isWarning
+					? 'border-amber-400/30 bg-amber-500/10 dark:bg-amber-500/15'
+					: 'border-destructive/20 bg-destructive/10 dark:bg-destructive/15'
+			)}
+		>
+			<span
+				class={cn(
+					'flex size-7 shrink-0 items-center justify-center rounded-full',
+					isWarning
+						? 'bg-amber-500 text-white'
+						: 'bg-destructive text-destructive-foreground'
+				)}
+				aria-hidden="true"
+			>
+				{#if isWarning}
+					<AlertTriangle class="size-4" />
+				{:else}
+					<AlertCircle class="size-4" />
+				{/if}
+			</span>
+			<p class="min-w-0 flex-1 text-sm font-semibold text-foreground">{title}</p>
+
+			<button
+				type="button"
+				class="inline-flex h-7 cursor-pointer items-center rounded-md px-2 text-xs text-muted-foreground transition-colors hover:bg-muted hover:text-foreground"
+				onclick={() => onClose?.()}
+			>
+				{labels.clear}
+			</button>
+
+			<button
+				type="button"
+				class="inline-flex size-7 cursor-pointer items-center justify-center rounded-md text-muted-foreground transition-colors hover:bg-muted hover:text-foreground"
+				onclick={toggleExpanded}
+				aria-expanded={expanded}
+				aria-label={labels.toggleDetailsAria}
+			>
+				{#if expanded}
+					<ChevronUp class="size-4" />
+				{:else}
+					<ChevronDown class="size-4" />
+				{/if}
+			</button>
+		</div>
+
+		{#if expanded && rows.length > 0}
+			<div class="min-h-0 flex-1 overflow-y-auto">
+				<table class="w-full border-collapse text-sm">
+					<thead>
+						<tr class="border-b border-border bg-muted/30">
+							<th
+								class="w-10 px-2 py-1.5 text-center text-[10px] font-semibold tracking-widest text-muted-foreground uppercase"
+							>
+								{labels.columnType}
+							</th>
+							<th
+								class="w-[38%] px-2 py-1.5 text-center text-[10px] font-semibold tracking-widest text-muted-foreground uppercase"
+							>
+								{labels.columnField}
+							</th>
+							<th
+								class="px-2 py-1.5 text-left text-[10px] font-semibold tracking-widest text-muted-foreground uppercase"
+							>
+								{labels.columnMessage}
+							</th>
+							{#if dismissibleRows && onDismissRow}
+								<th class="w-8"></th>
+							{/if}
+						</tr>
+					</thead>
+					<tbody>
+						{#each rows as row, i (i)}
+							<tr class="border-b border-border/50 hover:bg-muted/20">
+								<td class="px-2 py-2.5 text-center align-middle">
+									<span
+										class={cn(
+											'inline-flex size-5 items-center justify-center rounded-full text-[11px] font-bold leading-none',
+											isWarning
+												? 'bg-amber-500 text-white'
+												: 'bg-destructive text-destructive-foreground'
+										)}
+										aria-hidden="true"
+									>
+										{#if isWarning}
+											<AlertTriangle class="size-3" />
+										{:else}
+											×
+										{/if}
+									</span>
+								</td>
+								<td
+									class="break-words px-2 py-2.5 align-middle text-center font-semibold text-foreground"
+								>
+									{row.field || labels.emptyField}
+								</td>
+								<td class="break-words px-2 py-2.5 align-top text-left leading-relaxed text-muted-foreground">
+									{row.message}
+								</td>
+								{#if dismissibleRows && onDismissRow}
+									<td class="px-1 py-2 text-center align-middle">
+										<button
+											type="button"
+											class="inline-flex size-6 cursor-pointer items-center justify-center rounded text-muted-foreground transition-colors hover:bg-muted hover:text-foreground"
+											onclick={() => onDismissRow!(i)}
+											aria-label={labels.dismissRowAria}
+										>
+											<X class="size-3" />
+										</button>
+									</td>
+								{/if}
+							</tr>
+						{/each}
+					</tbody>
+				</table>
+			</div>
+		{/if}
+	</div>
+{/if}