groceries stats: fix array/json params for the app client (live store filter 500), CPI axis, header spacing

src/routes/trackers/groceries/stats/+page.svelte

@@ -394,7 +394,12 @@
 			tooltip: { trigger: 'axis', valueFormatter: (v: number) => (v == null ? '–' : v.toFixed(2)) },
 			legend: legend(t),
 			xAxis: { type: 'category', data: (s?.days ?? []).map(fmtDay), axisLabel: { color: t.muted } },
-			yAxis: axisVal(t),
+			yAxis: {
+				...axisVal(t),
+				scale: true,
+				minInterval: 0.1,
+				axisLabel: { color: t.muted, formatter: (v: number) => v.toFixed(1) }
+			},
 			series: ids.map((k) => ({
 				name: sname(Number(k)),
 				type: 'line',
@@ -588,8 +593,8 @@
 			<p class="mt-2 flex flex-wrap items-center gap-1.5 text-sm text-[var(--site-muted)]">
 				<Lock size={14} aria-hidden="true" />
 				{#if ready && meta}
-					Snapshot of {fmtDay(ready.day)} · {historyDays} day{historyDays === 1 ? '' : 's'} of price history{#if ready.durationMs}
-						· computed in {(ready.durationMs / 1000).toFixed(1)} s{/if}
+					Snapshot of {fmtDay(ready.day)} · {historyDays} day{historyDays === 1 ? '' : 's'} of price history
+					{#if ready.durationMs}· computed in {(ready.durationMs / 1000).toFixed(1)} s{/if}
 				{:else}Who's cheapest, how often, and by how much.{/if}
 			</p>
 		</div>