fix: validate workspace drafts and reconcile models

frontend/src/shell/SteerInput.tsx

@@ -189,6 +189,27 @@ export function ComposerFooter() {
     ? models.filter((candidate) => allowedModels.includes(`${candidate.provider}/${candidate.id}`))
     : models;
 
+  useEffect(() => {
+    if (!allowedModels?.length) return;
+    const selected = preferences.provider && preferences.model
+      ? `${preferences.provider}/${preferences.model}`
+      : undefined;
+    if (selected && allowedModels.some((allowed) => allowed === selected)) return;
+    const replacement = workspaceRecord?.workspace.llm_policy.default
+      && allowedModels.includes(workspaceRecord.workspace.llm_policy.default)
+      ? workspaceRecord.workspace.llm_policy.default
+      : allowedModels[0];
+    const separator = replacement.indexOf("/");
+    if (separator <= 0 || separator === replacement.length - 1) return;
+    const next = {
+      ...preferences,
+      provider: replacement.slice(0, separator),
+      model: replacement.slice(separator + 1),
+    };
+    workspacePreferences.save(next);
+    setPreferences(next);
+  }, [allowedModels, preferences, workspaceRecord]);
+
   function update(patch: WorkspacePreference) {
     const next = workspacePreferences.save({ ...preferences, ...patch });
     setPreferences(next);
@@ -200,6 +221,7 @@ export function ComposerFooter() {
   }
 
   const knownModel = policyModels.some((m) => m.id === model);
+  const showModelFallback = !allowedModels && !knownModel;
   const contextPct = tokenUsage && tokenUsage.contextWindow > 0
     ? tokenUsage.totalTokens / tokenUsage.contextWindow
     : 0;
@@ -232,7 +254,7 @@ export function ComposerFooter() {
             <option value={model}>{model || "— model —"}</option>
           ) : (
             <>
-              {!knownModel && <option value={model}>{model || "— model —"}</option>}
+              {showModelFallback && <option value={model}>{model || "— model —"}</option>}
               {policyModels.map((m) => (
                 <option key={`${m.provider}/${m.id}`} value={m.id}>
                   {m.name}