Web-UI: Model Managemant inaccessible on Mobile

[bluemoehre]

If you need to swap models while on the road, this is currently impossible because all action buttons are displayed only on hover, which works only with pointer devices.

Pragmatic fix

Add a "long‑press" listener to the list item to trigger the hover state via JavaScript. This should apply to all touch device.

Long‑term fix

1. Provide a Triple Bullet Horizontal button to show all actions inline, overlapping the model name while open.

2. Provide a Triple Bullet Vertical button to show all action in a dropdown.

3. Redesign the list items so the actions appear on a second line. (Con: this requires additonal layout space)

[allozaur]

Will re-work this as a part of https://github.com/ggml-org/llama.cpp/milestone/2 and https://github.com/ggml-org/llama.cpp/milestone/3