The /logs.html header puts a flex:1 sub-tab strip (`.logs-tabbar`) next
to the ← home back-link inside the flex `.page-header`. The strip is
itself a flex container, so its default `min-width: auto` keeps it at its
intrinsic content width and — without an explicit nowrap on the parent —
it gets pushed onto its own row under the back-link.
Mirror the working dashboard chrome (`.dashboard-chrome` / `.tabbar`,
which sets `flex-wrap: nowrap`): make `.page-header` explicitly nowrap and
give `.logs-tabbar` `min-width: 0` so it shrinks to share the row instead
of wrapping. Affects every standalone page that uses `.page-header`
(flow / logs / stats / settings); the nowrap is correct for all of them.
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