Opening a shared link now says what is happening: if the repository
isn't loaded in the tab, a card explains it is being pulled from GitHub
and where you'll be taken, the progress keeps that framing, and once it
is built the camera flies to the linked position (walk and fly views
start from the helicopter's eye) with the file selected. A link to the
repository already open goes straight there, including links pasted
into an open tab (hashchange), without re-cloning.
If the clone needs GitHub access, a warning explains the link points to
a private repository and access has expired or isn't set up on this
device, with Sign in (or Grant access). The pending link survives the
sign-in round trip and continues automatically afterwards. Pending
links are dropped on other failures or when a different repository is
opened by hand. City guide updated.