Clicking the LibrePortal logo 6→9 times spawned four separate
"X clicks away from being a developer" notifications stacked on top of
each other — visual noise for a delightful-bonus interaction.
Now the easter egg keeps a single reference to its current toast and
mutates the `.notification-message` text in place on each subsequent
click. When the toast's 10s auto-remove timer expires mid-sequence
(slow clicker) the next click opens a fresh one — same fallback for
the idle-reset path that clears the count after 3s.
`_devToast` now returns the notification element so the easter-egg
handler can grab it; previously it returned undefined, fine for the
one-shot toasts but no longer enough for the rolling-update pattern.
Signed-off-by: librelad <librelad@digitalangels.vip>
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