Change description field to textarea in Add New Feature modal

The description field in the Add New Feature modal is now a textarea instead of
an input, allowing users to enter multi-line feature descriptions more easily.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

app/src/store/app-store.ts

@@ -401,6 +401,7 @@ export const useAppStore = create<AppState & AppActions>()(
       name: "automaker-storage",
       partialize: (state) => ({
         projects: state.projects,
+        currentProject: state.currentProject,
         theme: state.theme,
         sidebarOpen: state.sidebarOpen,
         apiKeys: state.apiKeys,