The docs header no longer breaks on narrow screens. The "Back to app" button
wrapped its label onto two lines and the row ran out of room. At ≤720px the header now
collapses cleanly: the back CTA becomes an icon-only square, the "Docs" brand suffix
drops, gaps/padding tighten, and nothing wraps (labels are nowrap + flex-shrink: 0).
The status page had the same latent bug: its mobile rule hid .st-back span, but
the label wasn't wrapped in a span, so it never applied. Label wrapped, and the back
button now becomes an icon-only square at ≤640px with a tightened header row.
