fix(desktop): deleting the active profile reliably falls back to default

Centralize the fallback in DeleteProfileDialog (the single delete choke
point) so both the rail and the Profiles view inherit it. Reset *after*
the host's onDeleted refresh so a refreshActiveProfile racing the dying
backend can't clobber the pill back to the deleted profile, and set
$activeProfile too (selectProfile only moved the gateway, leaving the
statusbar pill stranded on the dead profile).

apps/desktop/src/app/chat/sidebar/profile-switcher.tsx

@@ -264,16 +264,7 @@ export function ProfileRail() {
 
       <DeleteProfileDialog
         onClose={() => setPendingDelete(null)}
-        onDeleted={async () => {
+        onDeleted={refreshActiveProfile}
-          // Deleting the profile you're currently in would strand the gateway on
-          // a dead profile — fall back to default.
-          const wasActive = pendingDelete != null && normalizeProfileKey(pendingDelete.name) === activeKey
-          await refreshActiveProfile()
-
-          if (wasActive) {
-            selectProfile('default')
-          }
-        }}
         open={pendingDelete !== null}
         profile={pendingDelete}
       />

apps/desktop/src/app/profiles/delete-profile-dialog.tsx

@@ -1,8 +1,10 @@
 import { ConfirmDialog } from '@/components/ui/confirm-dialog'
 import { deleteProfile } from '@/hermes'
+import { $activeGatewayProfile, normalizeProfileKey, selectProfile, setActiveProfile } from '@/store/profile'
 
 // Thin wrapper over ConfirmDialog: owns the deleteProfile call, inherits
-// Enter-to-confirm + busy/done/error from the shared dialog.
+// Enter-to-confirm + busy/done/error from the shared dialog. The single choke
+// point for every delete entry point (rail + Profiles view).
 export function DeleteProfileDialog({
   profile,
   onClose,
@@ -34,8 +36,20 @@ export function DeleteProfileDialog({
           return
         }
 
+        // Deleting the profile the live gateway is on strands it on a dead
+        // backend. Capture that before the delete; reset *after* the host's
+        // onDeleted refresh so our reset is the last write — a refreshActiveProfile
+        // racing the (still-dying) backend can't clobber the pill back to it.
+        const wasActive = normalizeProfileKey(profile.name) === normalizeProfileKey($activeGatewayProfile.get())
         await deleteProfile(profile.name)
         await onDeleted?.()
+
+        if (wasActive) {
+          // Swap gateway/sidebar to default and set the pill now — the primary
+          // backend is always default, so this is correct, not just optimistic.
+          selectProfile('default')
+          setActiveProfile('default')
+        }
       }}
       open={open}
       title="Delete profile?"