fix: always persist chart layout tab state in URL

Remove the `permanent: props.permalink` option so the layout query
param is written to the URL on every page (including Compare Trends),
not only when the permalink prop is true.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: Adebesin-Cell

app/components/Package/TrendsChart.vue

@@ -1624,9 +1624,7 @@ watch(selectedMetric, value => {
 })
 
 // Sparkline charts (a11y alternative display for multi series)
-const chartLayout = usePermalink<'combined' | 'split'>('layout', 'combined', {
-  permanent: props.permalink,
-})
+const chartLayout = usePermalink<'combined' | 'split'>('layout', 'combined')
 const isSparklineLayout = computed({
   get: () => chartLayout.value === 'split',
   set: (v: boolean) => {