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/vscode/webview/api/git.ts

@@ -90,10 +90,15 @@ export const createVSCodeGitAPI = (): GitAPI => ({
     });
   },
 
-  generateCommitMessage: async (directory: string, files: string[]): Promise<{ message: GeneratedCommitMessage }> => {
+  generateCommitMessage: async (
+    directory: string,
+    files: string[],
+    options?: { zenModel?: string; providerId?: string; modelId?: string }
+  ): Promise<{ message: GeneratedCommitMessage }> => {
     // This requires AI integration - stubbed for now
     void directory; // Unused for now
     void files; // Unused for now
+    void options; // Unused for now
     return {
       message: {
         subject: '',
@@ -104,12 +109,16 @@ export const createVSCodeGitAPI = (): GitAPI => ({
 
   generatePullRequestDescription: async (
     directory: string,
-    payload: { base: string; head: string }
+    payload: { base: string; head: string; context?: string; zenModel?: string; providerId?: string; modelId?: string }
   ): Promise<GeneratedPullRequestDescription> => {
     return sendBridgeMessage<GeneratedPullRequestDescription>('api:git/pr-description', {
       directory,
       base: payload.base,
       head: payload.head,
+      context: payload.context,
+      zenModel: payload.zenModel,
+      providerId: payload.providerId,
+      modelId: payload.modelId,
     });
   },