* fix(ui): make timeline dialog fit small screens
On phones the timeline dialog squeezed the message list to a couple of
rows: header, search box, and the fixed Actions/help block consumed
almost all of the 70vh dialog height, and the description text could end
up underneath the search box.
The dialog no longer scrolls as a whole. The header and search stay
fixed (shrink-0), the message list is the only scrollable region and
takes the remaining height (min-h-0 flex-1), the dialog is taller on
small screens (85dvh), the Actions/help footer collapses to a single
action row on phones, and the description is hidden on phones only.
Message timestamps no longer wrap either: the time column grows from a
fixed 64px minimum and forces nowrap, so "11:14 PM" stays on one line.
* fix(ui): keep dialog-level scroll fallback in timeline
overflow-y-visible removed the reusable dialog's built-in scrolling
fallback: the timeline's header, search, and footer are all shrink-0,
so under constrained layouts (very short desktop windows, enlarged
text) the fixed controls could leave the popup with no way to reach
them once the message list collapsed to zero.
Revert to overflow-y-auto. The list is still the only flex-1 min-h-0
child and absorbs space first, so normal mobile and desktop layouts do
not scroll; only when fixed content exceeds the dialog height does the
popup scroll again, keeping every control reachable.
CodeNebula
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