fix(csp): allow external images in App Store and suppress console warnings (#138)

Add https: to img-src CSP directive so App Store template icons from
external registries (raw.githubusercontent.com) load correctly. Disable
Origin-Agent-Cluster header (only meaningful over HTTPS). Add minWidth={0}
to Recharts ResponsiveContainer to suppress dimension warnings.

frontend/src/components/ui/chart.tsx

@@ -63,7 +63,7 @@ const ChartContainer = React.forwardRef<
         {...props}
       >
         <ChartStyle id={chartId} config={config} />
-        <RechartsPrimitive.ResponsiveContainer>
+        <RechartsPrimitive.ResponsiveContainer minWidth={0}>
           {children}
         </RechartsPrimitive.ResponsiveContainer>
       </div>