[Blazor] Improve Blazor Server reconnect UI

[MackinnonBuck]

There are some UX enhancements that we should consider making to the default Blazor Server reconnection dialog:

• Display how many seconds are remaining until the next reconnection attempt
  • This could either replace the "attempts remaining" status or coexist with it
• Quickly attempt the initial reconnection and use exponential backoff to progressively increase the reconnect interval
• Allow the user to manually initiate a reconnect rather than wait for the reconnect interval to complete
• Automatically refresh the page when the max number of reconnection attempts have been reached
  • We may need some kind of "stateful reconnection" mechanism before adding this to avoid preemptively clearing browser-side state
• Improve general styling

Related: #32113