feat: enhance suggestion generation with model and thinking level overrides

- Updated the generateSuggestions function to accept model and thinking level overrides, allowing for more flexible suggestion generation.
- Modified the API client and UI components to support passing these new parameters, improving user control over the suggestion process.
- Introduced a new phase model for AI Suggestions in settings, enhancing the overall functionality and user experience.

apps/ui/src/lib/http-api-client.ts

@@ -1305,8 +1305,13 @@ export class HttpApiClient implements ElectronAPI {
 
   // Suggestions API
   suggestions: SuggestionsAPI = {
-    generate: (projectPath: string, suggestionType?: SuggestionType) =>
-      this.post('/api/suggestions/generate', { projectPath, suggestionType }),
+    generate: (
+      projectPath: string,
+      suggestionType?: SuggestionType,
+      model?: string,
+      thinkingLevel?: string
+    ) =>
+      this.post('/api/suggestions/generate', { projectPath, suggestionType, model, thinkingLevel }),
     stop: () => this.post('/api/suggestions/stop'),
     status: () => this.get('/api/suggestions/status'),
     onEvent: (callback: (event: SuggestionsEvent) => void) => {