fix(mobile): show a clear message when a new session cannot start

apps/mobile/src/components/agents/cloud-prepare-error-display.test.ts

@@ -59,6 +59,24 @@ describe('cloudPrepareFailureMessage', () => {
     );
   });
 
+  it('maps a missing profile record to the removed-or-unavailable copy', () => {
+    const missing = makeError('NOT_FOUND', "Profile 'profile-42' not found");
+    const message = cloudPrepareFailureMessage(missing);
+    expect(message).toBe('This item may have been removed or is no longer available.');
+    expect(message).not.toContain('profile-42');
+  });
+
+  it('maps the shaped form of a missing record too', () => {
+    const missing = {
+      shape: {
+        data: { code: 'NOT_FOUND', message: "Profile 'profile-42' not found" },
+      },
+    };
+    expect(cloudPrepareFailureMessage(missing)).toBe(
+      'This item may have been removed or is no longer available.'
+    );
+  });
+
   it('never shows the raw server detail for an unclassified rejection', () => {
     const raw = makeError('BAD_REQUEST', 'Runtime credential proxy configuration is unavailable');
     const message = cloudPrepareFailureMessage(raw);

apps/mobile/src/components/agents/cloud-prepare-error-display.ts

@@ -17,9 +17,12 @@ const MODEL_UNAVAILABLE_MESSAGE = 'Selected model is not available for this clou
 
 /**
  * The localized failure copy for a rejected cloud prepare. Only failures the
- * message names precisely get actionable copy; every other rejection — an
- * unclassified server detail, an unknown transport failure — gets the generic
- * service line, because the tRPC code alone does not identify the failure.
+ * message names precisely, plus the missing-selection code, get actionable
+ * copy; every other rejection — an unclassified server detail, an unknown
+ * transport failure — gets the generic service line, because the tRPC code
+ * alone does not identify the failure. Prepare resolves the requested profile
+ * before it registers the session, so its only `NOT_FOUND` is a profile that
+ * no longer exists: the reader refreshes the selection instead of retrying.
  */
 export function cloudPrepareFailureMessage(error: unknown): string {
   const message = readTrpcErrorField(error, 'message');
@@ -29,6 +32,9 @@ export function cloudPrepareFailureMessage(error: unknown): string {
   if (message === MODEL_UNAVAILABLE_MESSAGE) {
     return i18n.t('agentChat.session.modelUnavailable');
   }
+  if (readTrpcErrorField(error, 'code') === 'NOT_FOUND') {
+    return i18n.t('queryError.notFoundDescription');
+  }
   if (readTrpcErrorField(error, 'code') === 'PAYMENT_REQUIRED') {
     return i18n.t('agentChat.session.notEnoughCredits');
   }