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webui/src/components/UndockedPageExitGuard/index.jsx

@@ -1,10 +1,13 @@
 // Undocked Page Exit Guard
 // Purpose: Asks the browser to confirm document-level navigation while the current driver's rover is undocked.
-// Scope: Owns only the native beforeunload lifecycle; it does not render UI or attempt to replace browser safety dialogs.
+// Scope: Owns the native beforeunload lifecycle and queues the matching AlertFeed explanation when leaving is attempted.
 import { useEffect } from 'react';
 import { useControlSelector } from '../../controls/index.js';
+import { useSessionActions } from '../../context/SessionContext.jsx';
 import { useTelemetrySelector } from '../../context/TelemetryContext.jsx';
 
+const UNDOCKED_EXIT_ALERT_LIFETIME_MS = 15 * 1000;
+
 function selectHomeBaseState(frame) {
   const homeBase = frame?.sensors?.chargingSources?.homeBase;
 
@@ -19,6 +22,7 @@ function selectHomeBaseState(frame) {
 export default function UndockedPageExitGuard() {
   const roverId = useControlSelector((control) => control.state.roverId);
   const homeBaseState = useTelemetrySelector(roverId, selectHomeBaseState);
+  const { pushAlert } = useSessionActions();
   const shouldConfirmExit = Boolean(roverId) && homeBaseState === false;
 
   useEffect(() => {
@@ -33,6 +37,18 @@ export default function UndockedPageExitGuard() {
       */
       event.preventDefault();
       event.returnValue = true;
+
+      /*
+        If the driver cancels the browser-owned confirmation, React remains
+        mounted and AlertFeed presents the actionable reason for the warning.
+        A stable id refreshes this one warning lane on another exit attempt
+        instead of stacking duplicate cards over the driving interface.
+      */
+      pushAlert({
+        id: 'undocked-page-exit-warning',
+        kind: 'undocked-exit-warning',
+        lifetimeMs: UNDOCKED_EXIT_ALERT_LIFETIME_MS,
+      });
     }
 
     window.addEventListener('beforeunload', handleBeforeUnload);
@@ -44,7 +60,7 @@ export default function UndockedPageExitGuard() {
       */
       window.removeEventListener('beforeunload', handleBeforeUnload);
     };
-  }, [shouldConfirmExit]);
+  }, [pushAlert, shouldConfirmExit]);
 
   return null;
 }