feat: replace `ion-loading` with `ion-skeleton-text`

[robingenz]

Feature request

Is your feature request related to a problem? Please describe:

While the loading box is visible, you cannot do anything. This is especially annoying if you have a bad internet connection, for example.

Describe the solution you'd like:

Replace ion-loading overlay with ion-skeleton-text to display a placeholder preview of the page content before the data gets loaded to reduce load-time frustration.

Describe alternatives you've considered:

Additional context: