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/lib/gitApiHttp.ts

@@ -210,7 +210,7 @@ export async function deleteRemoteBranch(directory: string, payload: GitDeleteRe
 export async function generateCommitMessage(
   directory: string,
   files: string[],
-  options?: { zenModel?: string }
+  options?: { zenModel?: string; providerId?: string; modelId?: string }
 ): Promise<{ message: GeneratedCommitMessage }> {
   if (!Array.isArray(files) || files.length === 0) {
     throw new Error('No files provided to generate commit message');
@@ -220,6 +220,12 @@ export async function generateCommitMessage(
   if (options?.zenModel) {
     body.zenModel = options.zenModel;
   }
+  if (options?.providerId) {
+    body.providerId = options.providerId;
+  }
+  if (options?.modelId) {
+    body.modelId = options.modelId;
+  }
 
   const response = await fetch(buildUrl(`${API_BASE}/commit-message`, directory), {
     method: 'POST',
@@ -259,20 +265,26 @@ export async function generateCommitMessage(
 
 export async function generatePullRequestDescription(
   directory: string,
-  payload: { base: string; head: string; context?: string; zenModel?: string }
+  payload: { base: string; head: string; context?: string; zenModel?: string; providerId?: string; modelId?: string }
 ): Promise<{ title: string; body: string }> {
-  const { base, head, context, zenModel } = payload;
+  const { base, head, context, zenModel, providerId, modelId } = payload;
   if (!base || !head) {
     throw new Error('base and head are required');
   }
 
-  const requestBody: { base: string; head: string; context?: string; zenModel?: string } = { base, head };
+  const requestBody: { base: string; head: string; context?: string; zenModel?: string; providerId?: string; modelId?: string } = { base, head };
   if (context?.trim()) {
     requestBody.context = context.trim();
   }
   if (zenModel) {
     requestBody.zenModel = zenModel;
   }
+  if (providerId) {
+    requestBody.providerId = providerId;
+  }
+  if (modelId) {
+    requestBody.modelId = modelId;
+  }
 
   const response = await fetch(buildUrl(`${API_BASE}/pr-description`, directory), {
     method: 'POST',