Update models menu dialog to support manual model selection and group… (#80)

* Update models menu dialog to support manual model selection and group by model family

* fix tests

* update codebase investigator model setting

* fix test

* fix test

* update generated golden file

* regenerate scheme and doc for settings

* use Preview Auto if previewFeatures is set to true

packages/cli/src/zed-integration/zedIntegration.ts

@@ -256,9 +256,8 @@ export class Session {
 
       try {
         const model = getEffectiveModel(
-          this.config.isInFallbackMode(),
           this.config.getModel(),
-          this.config.getPreviewFeatures(),
+          this.config.isInFallbackMode(),
         );
         const responseStream = await chat.sendMessageStream(
           { model },