fix(beszel): correct unit scaling for system stats and container charts

Beszel API returns pre-scaled values, not raw bytes as the types claimed:
- Storage (du/mu/mb): GB — remove /BYTES_TO_GB division
- Disk I/O (dr/dw): MB/s — multiply by 1024² for formatters
- Container memory (m): MB — multiply by 1024² for formatters
- Container network (b/ns/nr): bytes/s — passthrough, unchanged

Also fix Recharts width(-1)/height(-1) warnings by adding w=100%
and minHeight:0 to BeszelAreaChart.

packages/widgets/src/beszel-system-stats/component.tsx

@@ -63,23 +63,23 @@ export default function BeszelSystemStatsWidget({
     { staleTime: 30 * 1000 },
   );
 
-  // BeszelSystemStats fields are documented in beszel-types.ts.
-  // mu/du = bytes, dr/dw = bytes/s, b = public bandwidth [sent,recv] bytes/s, ns/nr = all-interface bytes/s
-  const BYTES_TO_GB = 1024 * 1024 * 1024;
+  // BeszelSystemStats fields: storage values (m, mu, mb, d, du, s, su) are already in GB.
+  // Disk I/O (dr, dw) is in MB/s — scale to bytes/s for display formatters.
+  // Network (ns, nr, b) is in bytes/s. Container memory (m) is in MB.
 
   const cpuMap = useCallback((s: { cpu: number }) => ({ [t("chart.cpu.series")]: s.cpu }), [t]);
   const memoryMap = useCallback(
     (s: { mu: number; mb: number }) => ({
-      [t("chart.memory.series")]: s.mu / BYTES_TO_GB,
-      [t("chart.memory.cache")]: (s.mb ?? 0) / BYTES_TO_GB,
+      [t("chart.memory.series")]: s.mu,
+      [t("chart.memory.cache")]: s.mb ?? 0,
     }),
     [t],
   );
-  const diskMap = useCallback((s: { du: number }) => ({ [t("chart.disk.series")]: s.du / BYTES_TO_GB }), [t]);
+  const diskMap = useCallback((s: { du: number }) => ({ [t("chart.disk.series")]: s.du }), [t]);
   const diskIOMap = useCallback(
     (s: { dr?: number; dw?: number }) => ({
-      [t("chart.diskIO.read")]: s.dr ?? 0,
-      [t("chart.diskIO.write")]: s.dw ?? 0,
+      [t("chart.diskIO.read")]: (s.dr ?? 0) * (1024 * 1024),
+      [t("chart.diskIO.write")]: (s.dw ?? 0) * (1024 * 1024),
     }),
     [t],
   );

packages/widgets/src/beszel/_shared/chart.tsx

@@ -46,7 +46,8 @@ export const BeszelAreaChart = ({ yAxisFormatter, yAxisDomain, yAxisProps, style
     withDots={false}
     withXAxis
     withYAxis
-    style={{ minWidth: 0, ...style }}
+    w="100%"
+    style={{ minWidth: 0, minHeight: 0, ...style }}
     yAxisProps={{
       ...yAxisBase,
       ...(yAxisDomain ? { domain: yAxisDomain } : {}),
@@ -83,10 +84,12 @@ export const useContainerNames = (containerStats: BeszelContainerStatsRecord[] |
 
 type ContainerExtractor = (container: BeszelContainerStatsRecord["stats"][number] | undefined) => number;
 
-// c = CPU (%), m = memory (bytes), b = bandwidth [sent,recv] (bytes/s), ns/nr = legacy net (bytes/s)
+// c = CPU (%), m = memory (MB), b = bandwidth [sent,recv] (bytes/s), ns/nr = legacy net (bytes/s)
+const MB = 1024 * 1024;
+
 const defaultContainerExtractors: Record<string, ContainerExtractor> = {
   cpu: (c) => c?.c ?? 0,
-  memory: (c) => c?.m ?? 0,
+  memory: (c) => (c?.m ?? 0) * MB,
   network: (c) => (c?.b ? c.b[0] + c.b[1] : (c?.ns ?? 0) + (c?.nr ?? 0)),
 };