fix(auth/session): preserve override reset behavior and repair oauth profile-id drift (openclaw#18820) thanks @Glucksberg

Verified:
- pnpm build
- pnpm check
- pnpm test:macmini

Co-authored-by: Glucksberg <80581902+Glucksberg@users.noreply.github.com>
Co-authored-by: Tak Hoffman <781889+Takhoffman@users.noreply.github.com>

src/agents/model-fallback.ts

@@ -96,6 +96,10 @@ type ModelFallbackRunResult<T> = {
   attempts: FallbackAttempt[];
 };
 
+function sameModelCandidate(a: ModelCandidate, b: ModelCandidate): boolean {
+  return a.provider === b.provider && a.model === b.model;
+}
+
 function throwFallbackFailureSummary(params: {
   attempts: FallbackAttempt[];
   candidates: ModelCandidate[];
@@ -193,6 +197,7 @@ function resolveFallbackCandidates(params: {
   const providerRaw = String(params.provider ?? "").trim() || defaultProvider;
   const modelRaw = String(params.model ?? "").trim() || defaultModel;
   const normalizedPrimary = normalizeModelRef(providerRaw, modelRaw);
+  const configuredPrimary = normalizeModelRef(defaultProvider, defaultModel);
   const aliasIndex = buildModelAliasIndex({
     cfg: params.cfg ?? {},
     defaultProvider,
@@ -209,6 +214,11 @@ function resolveFallbackCandidates(params: {
     if (params.fallbacksOverride !== undefined) {
       return params.fallbacksOverride;
     }
+    // Skip configured fallback chain when the user runs a non-default override.
+    // In that case, retry should return directly to configured primary.
+    if (!sameModelCandidate(normalizedPrimary, configuredPrimary)) {
+      return []; // Override model failed → go straight to configured default
+    }
     const model = params.cfg?.agents?.defaults?.model as
       | { fallbacks?: string[] }
       | string