feat(ui): add delete button to RecipeSheet + fix NaNd ago + full QueueItem in POST response

- RecipeSheet: add onDelete prop and 'Remove from queue' button at bottom of sheet
- +page.svelte: wire onDelete -> removeItem in RecipeSheet
- POST /api/queue: return full QueueItem (with createdAt, phases) instead of stripped subset
- TimelineRow: defensive relTime() handles undefined/NaN, uses createdAt ?? enqueuedAt

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

src/routes/+page.svelte

@@ -352,6 +352,7 @@
 			item={selectedItem}
 			onClose={() => (selectedItem = null)}
 			onRetry={(id) => { retryItem(id); selectedItem = null; }}
+			onDelete={(id) => { removeItem(id); selectedItem = null; }}
 		/>
 	{/if}
 </div>

src/routes/components/RecipeSheet.svelte

@@ -14,8 +14,9 @@
 		item: QueueItem | null;
 		onClose?: () => void;
 		onRetry?: (id: string) => void;
+		onDelete?: (id: string) => void;
 	}
-	let { item, onClose, onRetry }: Props = $props();
+	let { item, onClose, onRetry, onDelete }: Props = $props();
 
 	const PALETTE = ['#E1306C', '#FD7E14', '#FCAF45', '#833AB4', '#C13584'];
 	function strHash(s: string): number {
@@ -164,6 +165,14 @@
 						Open in Tandoor <External size={16} color="#fff" />
 					</a>
 				{/if}
+
+				<!-- Delete button -->
+				{#if onDelete}
+					<button class="ic-btn-reset delete-btn" onclick={() => { onDelete?.(item!.id); onClose?.(); }}>
+						<svg width="14" height="14" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><polyline points="3 6 5 6 21 6"/><path d="M19 6l-1 14a2 2 0 01-2 2H8a2 2 0 01-2-2L5 6"/><path d="M10 11v6M14 11v6"/><path d="M9 6V4a1 1 0 011-1h4a1 1 0 011 1v2"/></svg>
+						Remove from queue
+					</button>
+				{/if}
 			</div>
 		</div>
 	</div>
@@ -432,4 +441,24 @@
 		box-shadow: var(--shadow-lg);
 		text-decoration: none;
 	}
+	.delete-btn {
+		width: 100%;
+		margin-top: 12px;
+		padding: 14px;
+		border-radius: 99px;
+		background: transparent;
+		color: var(--muted);
+		font-size: 13px;
+		font-weight: 600;
+		display: flex;
+		align-items: center;
+		justify-content: center;
+		gap: 6px;
+		border: 1px solid var(--border);
+	}
+	.delete-btn:active {
+		background: rgba(255, 59, 48, 0.08);
+		color: var(--status-error);
+		border-color: var(--status-error);
+	}
 </style>