Fix JailsTab content pane not updating on jail switch

Add key={selectedActiveJail.name} and key={selectedInactiveJail.name} to
JailConfigDetail and InactiveJailDetail in JailsTab.tsx so React unmounts
and remounts the detail component whenever the selected jail changes,
resetting all internal state including the loadedRef guard.

frontend/src/components/config/JailsTab.tsx

@@ -898,12 +898,14 @@ export function JailsTab(): React.JSX.Element {
         >
           {selectedActiveJail !== undefined ? (
             <JailConfigDetail
+              key={selectedActiveJail.name}
               jail={selectedActiveJail}
               onSave={updateJail}
               onDeactivate={() => { handleDeactivate(selectedActiveJail.name); }}
             />
           ) : selectedInactiveJail !== undefined ? (
             <InactiveJailDetail
+              key={selectedInactiveJail.name}
               jail={selectedInactiveJail}
               onActivate={() => { setActivateTarget(selectedInactiveJail); }}
               onDeactivate={