Unify utility model settings and align git generation (#486)

* refactor(api): extend git generation payload types

* refactor(settings): add git provider model fields

* feat(config): persist git provider model defaults

* feat(git-api): send provider and model ids

* fix(git-api): forward generation options in runtime

* feat(git-view): use configured model for commit generation

* feat(git-view): pass configured model for PR generation

* feat(vscode): forward model selection in git bridge payload

* feat(vscode): align PR generation with session model flow

* feat(web): resolve and generate git text with provider model

* refactor(settings): unify utility model picker across providers

* chore(settings): rename sidebar item to utility model

* fix(git-model): validate and auto-heal stale utility selections

---------

Co-authored-by: Bohdan Triapitsyn <artmore@protonmail.com>

packages/ui/src/components/views/git/PullRequestSection.tsx

@@ -1128,13 +1128,25 @@ export const PullRequestSection: React.FC<{
     if (!directory) return;
     setIsGenerating(true);
     try {
-      const zenModel = useConfigStore.getState().settingsZenModel;
-      const generated = await generatePullRequestDescription(directory, {
+      const { getResolvedGitGenerationModel, settingsZenModel } = useConfigStore.getState();
+      const resolvedModel = getResolvedGitGenerationModel();
+      const payload: { base: string; head: string; context?: string; zenModel?: string; providerId?: string; modelId?: string } = {
         base: targetBaseBranch,
         head: branch,
-        context: additionalContext,
-        ...(zenModel ? { zenModel } : {}),
-      });
+      };
+      if (additionalContext) {
+        payload.context = additionalContext;
+      }
+      if (resolvedModel) {
+        payload.providerId = resolvedModel.providerId;
+        payload.modelId = resolvedModel.modelId;
+        if (resolvedModel.providerId === 'zen') {
+          payload.zenModel = resolvedModel.modelId;
+        }
+      } else if (settingsZenModel) {
+        payload.zenModel = settingsZenModel;
+      }
+      const generated = await generatePullRequestDescription(directory, payload);
 
       if (generated.title?.trim()) {
         setTitle(generated.title.trim());