The empty-state tip ("Add an AI endpoint from Settings...") shares a 60px
max-height ceiling with the one-line .welcome-sub / .welcome-version. On
narrow phones the welcome block shrink-wraps and the tip wraps to 4-5 lines
(~67px), so the shared ceiling clipped its last line ("...key into the
chat.") - the only setup hint a first-run user gets.
Give .welcome-tip its own taller max-height (120px), placed above the
@media (max-height: 650px) block so that rule's max-height:0 still collapses
the tip on short viewports. .welcome-sub / .welcome-version are untouched,
and desktop is unchanged (the tip is ~50px there, well under the ceiling).
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