Template links (#?template=<url>) keep their params in a bare "#?"
fragment. Since routing moved to the query string, only "#/" legacy
hashes are translated, and the root route was an empty query string,
so the template param was dropped and the dashboard opened without the
import dialog. Route a "#?" fragment as the query token, and treat a
query without a screen param as the root, as before.
Logged out users also lost the template: get-teams requires a session
and its 401 ended the flow before the params were kept for after login.
Skip it for the anonymous profile. This part already failed on main.
Closes#12127
AI-assisted-by: claude-opus-5-5
ddce3c2c95