fix(ui): model selection now updates all tiers correctly

- Add updateEnvBulk function for atomic multi-key updates
- Pass onEnvBulkChange prop to FriendlyUISection
- Fixes race condition where only last tier (haiku) was updated

ui/src/components/profiles/editor/index.tsx

@@ -67,6 +67,13 @@ export function ProfileEditor({ profileName, onDelete }: ProfileEditorProps) {
     setRawJsonEdits(JSON.stringify({ ...currentSettings, env: newEnv }, null, 2));
   };
 
+  // Bulk update multiple env vars at once (avoids race conditions)
+  const updateEnvBulk = (env: Record<string, string>) => {
+    const newEnv = { ...(currentSettings?.env || {}), ...env };
+    setLocalEdits((prev) => ({ ...prev, ...env }));
+    setRawJsonEdits(JSON.stringify({ ...currentSettings, env: newEnv }, null, 2));
+  };
+
   const addNewEnvVar = () => {
     if (!newEnvKey.trim()) return;
     const key = newEnvKey.trim();
@@ -179,6 +186,7 @@ export function ProfileEditor({ profileName, onDelete }: ProfileEditorProps) {
               onNewEnvKeyChange={setNewEnvKey}
               onNewEnvValueChange={setNewEnvValue}
               onEnvValueChange={updateEnvValue}
+              onEnvBulkChange={updateEnvBulk}
               onAddEnvVar={addNewEnvVar}
             />
           </div>