fix(tesla): skip OAuth on car after pair-code if desktop already linked Tesla

The pair-code flow always called startTeslaConnect() afterwards, which
redirected the car browser to auth.tesla.com even when the server already
held tokens from the desktop OAuth. Now connectIfNeeded() re-fetches
status post-login and short-circuits when connected: true. The car flow
becomes: enter 6-digit code → 'Tesla connected · Carried over from your
other device — ready to go.' No second OAuth.

client/src/pages/TeslaTripPlanner.tsx

@@ -1,7 +1,7 @@
 import React, { useState } from 'react';
 import { toast } from 'sonner';
 import { MapContainer, TileLayer, Marker, Polyline, Popup, useMap } from 'react-leaflet';
-import { useTesla, startTeslaConnect, disconnectTesla, sendToTeslaNav, wakeTesla, loginOwner, mintOwnerPairCode, redeemOwnerPairCode, type TeslaActiveRoute } from '../lib/tesla';
+import { useTesla, startTeslaConnect, disconnectTesla, sendToTeslaNav, wakeTesla, loginOwner, mintOwnerPairCode, redeemOwnerPairCode, fetchTeslaStatus, type TeslaActiveRoute } from '../lib/tesla';
 import { isMockEnabled, getMockScenario, setMockScenario, resetMockDrive } from '../lib/teslaMock';
 import { detectInCar } from '../lib/incar';
 import { computeBatteryPlan, type BatteryAtStop, type BatteryRisk } from '../lib/batteryPlan';
@@ -2452,16 +2452,28 @@ export default function TeslaTripPlanner() {
           teslaStatus={tesla.status}
           teslaState={tesla.state}
           onConnectTesla={async () => {
-            if (tesla.owner?.required && !tesla.owner.authenticated) {
+            // Pending action that runs after owner-login succeeds. Re-checks
-              ownerLoginThenRef.current = async () => {
+            // the server: if a Tesla token is already stored (e.g. the user
-                try { await startTeslaConnect(); }
+            // OAuthed on their desktop and just paired this device), we skip
-                catch { toast.error('Could not start Tesla OAuth'); }
+            // the Tesla OAuth round-trip entirely.
-              };
+            const connectIfNeeded = async () => {
-              setOwnerLoginOpen(true);
+              const fresh = await fetchTeslaStatus();
+              if (fresh.connected) {
+                await tesla.refreshStatus();
+                toast.success('Tesla connected', {
+                  description: 'Carried over from your other device — ready to go.',
+                });
                 return;
               }
               try { await startTeslaConnect(); }
               catch { toast.error('Could not start Tesla OAuth'); }
+            };
+            if (tesla.owner?.required && !tesla.owner.authenticated) {
+              ownerLoginThenRef.current = connectIfNeeded;
+              setOwnerLoginOpen(true);
+              return;
+            }
+            await connectIfNeeded();
           }}
           onDisconnectTesla={async () => {
             await disconnectTesla();