PWA support

[cl3mcg]

Is your feature request related to a problem? Please describe.
A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]
On iPhone, Safari's feature "Add the website to the Home Screen" allows the user to use a website as a PWA. A shortcut is created on the home screen of the user.
The PWA support from Podverse is minimal and the experience degraded.

• The sound controls are not always displayed on the iPhone Lock Screen.
• The PWA resets every-time the app is idle for a couple minutes (meaning that the podcast listened is starting from the beginning instead of continuing when it stopped).
• The podcast download cache is reset very often, resulting in multiple downloads of the same podcast episode.

Describe the solution you'd like
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I would (very humbly and very nicely) suggest Podverse's team to take a look at the best in class PWA implementation (such as Twitter's PWA, or Mastodon client called Elk) and try to implement something similar.

Describe alternatives you've considered
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No alternative per se.

Additional context
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PWA allows to have a decent app untied to any platform or operating system. PWA allows any user to install a functional app without depending on a specific store (or having to pay to deliver an app through a store). I believe that all of the above match the FOSS philosophy of Podverse.

Please feel free to join our Matrix space and chat with us in the #dev channel if you'd like to work on this.