Login form is briefly flashing

[heyarne]

To reproduce:

1. Login
2. Open some link in the app, for example an album
3. Copy the url
4. Paste it into a new tab

Behavior:
Before being redirected you can briefly see the login form after the loading spinner.

Expected behavior:
The loading spinner should be the only thing we see.

[heyarne]

This is because the app finishes the boot process after we have verified our credentials (or made sure there aren't any. The relevant code is here:

airsonic-ui/src/cljs/airsonic_ui/subs.cljs

Lines 5 to 12 in 727d454

	(defn is-booting?
	"The boot process starts with setting up routing and continues if we found
	previous credentials and ends when we receive a response from the server."
	[db _]
	;; so either we don't have any credentials or they are not verified
	(or (empty? (:current-route db))
	(and (not (empty? (:credentials db)))
	(not (get-in db [:credentials :verified?])))))

As soon as we have credentials, :events/logged-in is fired, which only then redirects, thus causing the flashing.