feat: service route branch handling, workspace hover card redesign, and agent form state improvements

- Add service-route-branch-handler for routing requests to branch-specific services
- Add service-hostname utility for generating hostnames from branch names
- Redesign workspace hover card with CI check status display
- Update combined model selector and sidebar workspace list
- Improve agent form state and input draft hooks
- Update checkout-git with enhanced branch handling
- Add workspace git watch and bootstrap improvements

packages/app/src/hooks/use-agent-input-draft.ts

@@ -88,12 +88,7 @@ function resolveEffectiveComposerModelId(input: {
   selectedModel: string;
   availableModels: AgentModelDefinition[];
 }): string {
-  const selectedModel = input.selectedModel.trim();
-  if (selectedModel) {
-    return selectedModel;
-  }
-
-  return input.availableModels.find((model) => model.isDefault)?.id ?? input.availableModels[0]?.id ?? "";
+  return input.selectedModel.trim();
 }
 
 function resolveEffectiveComposerThinkingOptionId(input: {