Support regular background widget refresh

[kylerm42]

I, like probably many others, am using Glance as a home page and new tab page. The search bar is where I start most of my navigation (hence #706), but I am frequently waiting for widgets to refresh before anything shows up. This PR aims to address some of these issues and ensure page loads are speedy every time.

• Predictive Widget Refresh

  • Updates widgets that are outdated OR will become outdated before the next refresh cycle
  • Prevents widgets from being stale when users visit pages
  • Example: With 15min refresh interval, a widget expiring in 5min gets updated proactively

• Configurable

  • background-refresh-enabled (default: false) - opt-in
  • background-refresh-interval (default: 15m) - customizable refresh frequency

  server:
    background-refresh-enabled: true
    background-refresh-interval: 10m

[gitnew12]

This is awesome. Another improvement is load widgets dynamically similar to getHomepage.

Load the dashboard instantly but for custom-api widgets, allow for empty <div> placeholders while API data is being fetched. Once request is processed, inject data into the placeholder <div>s. With the option to refresh the specific custom-api widgets on an interval.