ACE UI Feedback: Functional bugs regarding Model Switching, Cover Art, and Generation limits

What happened?
The ACE UI exhibits several functional disconnects where UI elements do not trigger the expected backend actions.

Simple Mode" forces instrumental generation regardless of the prompt/selection.
The "Song Cover" menu is unresponsive; clicking it does nothing.
Generation is hard-capped at 1 minute, regardless of settings.
Model switching/downloading is non-functional: selecting a new model (e.g., Base) shows a pink checkmark, but no download process is initiated, and the model does not switch.

Steps to reproduce

**Simple Mode Issue:** Select a style that requires vocals, ensure "Instrumental" is unchecked, and start generation. Result: Always instrumental.
**Cover Art:** Navigate to the song menu and click "Cover Song". Result: No action/menu appears.
**Model Switching:** Navigate to the model selection list. Click on a model other than "Turbo" (e.g., "Base"). Result: Pink checkmark appears, but no download/switch occurs in the terminal.
**Generation Length:** The duration is set to "Auto". Despite this default setting, the generation is consistently hard-capped at 60 seconds, which prevents the creation of full-length songs.

Your system

OS: Windows 10/11
GPU: NVIDIA RTX 4070 Ti Super (16GB VRAM)
CPU: AMD Ryzen 5950x
RAM: 64GB

Logs / full error output

No error logs were generated in the terminal/console. The issues described above are "silent fa