fix(board): beszel & calendar scale fix (#6737)

* fix(calendar): add cell spacing and scale day content with widget size

* fix(beszel): stop chart panels from leaving blank grid columns and size charts to fit the widget

* fix(widgets): address CodeRabbit review on calendar/beszel scaling PR

- beszel: account for the SimpleGrid row gap and the Stack gap between
  the controls row and the grid in the available-height budget, so a
  two-row layout no longer overflows the widget.
- calendar: memoize the day-cell scale lookup instead of recomputing
  it on every render.
- calendar: don't render the notification indicator row when none of
  a day's events have an indicatorColor, which was shifting the date
  number up with no visible dot to show for it.

Skipped one finding: the claim that .day's absolute inset:0 covers
monthCell's padding. It doesn't - the containing block for an
absolutely positioned element is the padding edge of its positioned
ancestor per the CSS spec, so the padding correctly insets .day. This
was also visually verified in the browser while building the fix.

* fix(beszel): don't treat availableHeight=0 as omitted in computeChartHeight

A falsy check on availableHeight also caught the legitimate value 0
(widget shorter than its own padding+controls), falling back to the
full 180px height instead of clamping to MIN_CHART_HEIGHT - the exact
overflow this height budget was meant to prevent.

packages/widgets/src/beszel/_shared/stats-view.tsx

@@ -62,9 +62,20 @@ interface BeszelStatsViewProps {
   timePeriod: BeszelTimePeriod;
   visibility: BeszelStatsVisibility;
   columns: 1 | 2;
+  availableHeight?: number;
   onSwitchToHistorical?: () => void;
 }
 
+const MIN_CHART_HEIGHT = 100;
+const PANEL_ROW_OVERHEAD = 28;
+const GRID_ROW_GAP = 16;
+
+const computeChartHeight = (availableHeight: number | undefined, rowCount: number) => {
+  if (availableHeight === undefined || rowCount <= 0) return CHART_HEIGHT;
+  const perRow = (availableHeight - (rowCount - 1) * GRID_ROW_GAP) / rowCount - PANEL_ROW_OVERHEAD;
+  return Math.max(MIN_CHART_HEIGHT, Math.min(CHART_HEIGHT, Math.floor(perRow)));
+};
+
 const whenVisible = <T,>(visible: boolean, data: T | undefined) => (visible ? data : undefined);
 
 export function BeszelStatsView({
@@ -73,6 +84,7 @@ export function BeszelStatsView({
   timePeriod,
   visibility,
   columns,
+  availableHeight,
   onSwitchToHistorical,
 }: BeszelStatsViewProps) {
   const t = useI18n("widget.beszelSystemStats");
@@ -248,14 +260,29 @@ export function BeszelStatsView({
     );
   }
 
+  const renderedPanelCount =
+    (visibility.cpu && cpuData.length > 0 ? 1 : 0) +
+    (visibility.memory && memoryData.length > 0 ? 1 : 0) +
+    (visibility.disk && diskData.length > 0 ? 1 : 0) +
+    (visibility.diskIO && diskIOData.length > 0 ? 1 : 0) +
+    (visibility.network && networkData.length > 0 ? 1 : 0) +
+    (showDocker && containerSeries.length > 0
+      ? (visibility.dockerCpu && dockerCpuData.length > 0 ? 1 : 0) +
+        (visibility.dockerMemory && dockerMemoryData.length > 0 ? 1 : 0) +
+        (visibility.dockerNetwork && dockerNetworkData.length > 0 ? 1 : 0)
+      : 0);
+  const effectiveColumns = Math.min(columns, Math.max(1, renderedPanelCount)) as 1 | 2;
+  const rowCount = Math.ceil(renderedPanelCount / effectiveColumns);
+  const chartHeight = computeChartHeight(availableHeight, rowCount);
+
   return (
-    <SimpleGrid cols={columns} spacing="md">
+    <SimpleGrid cols={effectiveColumns} spacing="md">
       {visibility.cpu && cpuData.length > 0 && (
         <BeszelChartPanel
           title={t("chart.cpu.title")}
           subtitle={t("chart.cpu.subtitle")}
           chartProps={{
-            h: CHART_HEIGHT,
+            h: chartHeight,
             data: cpuData,
             series: series.cpu,
             yAxisFormatter: chartAxisFormatters.percent,
@@ -269,7 +296,7 @@ export function BeszelStatsView({
           title={t("chart.memory.title")}
           subtitle={t("chart.memory.subtitle")}
           chartProps={{
-            h: CHART_HEIGHT,
+            h: chartHeight,
             data: memoryData,
             type: "stacked",
             series: series.memory,
@@ -283,7 +310,7 @@ export function BeszelStatsView({
           title={t("chart.disk.title")}
           subtitle={t("chart.disk.subtitle")}
           chartProps={{
-            h: CHART_HEIGHT,
+            h: chartHeight,
             data: diskData,
             type: "stacked",
             series: diskSeries,
@@ -297,7 +324,7 @@ export function BeszelStatsView({
           title={t("chart.diskIO.title")}
           subtitle={t("chart.diskIO.subtitle")}
           chartProps={{
-            h: CHART_HEIGHT,
+            h: chartHeight,
             data: diskIOData,
             series: series.diskIO,
             yAxisFormatter: chartAxisFormatters.rate,
@@ -310,7 +337,7 @@ export function BeszelStatsView({
           title={t("chart.network.title")}
           subtitle={t("chart.network.subtitle")}
           chartProps={{
-            h: CHART_HEIGHT,
+            h: chartHeight,
             data: networkData,
             series: series.network,
             yAxisFormatter: chartAxisFormatters.rate,
@@ -325,7 +352,7 @@ export function BeszelStatsView({
               title={t("chart.dockerCpu.title")}
               subtitle={t("chart.dockerCpu.subtitle")}
               chartProps={{
-                h: CHART_HEIGHT,
+                h: chartHeight,
                 data: dockerCpuData,
                 type: "stacked",
                 series: containerSeries,
@@ -339,7 +366,7 @@ export function BeszelStatsView({
               title={t("chart.dockerMemory.title")}
               subtitle={t("chart.dockerMemory.subtitle")}
               chartProps={{
-                h: CHART_HEIGHT,
+                h: chartHeight,
                 data: dockerMemoryData,
                 type: "stacked",
                 series: containerSeries,
@@ -353,7 +380,7 @@ export function BeszelStatsView({
               title={t("chart.dockerNetwork.title")}
               subtitle={t("chart.dockerNetwork.subtitle")}
               chartProps={{
-                h: CHART_HEIGHT,
+                h: chartHeight,
                 data: dockerNetworkData,
                 series: containerSeries,
                 yAxisFormatter: chartAxisFormatters.rate,