* fix(capabilities): tidy the extension detail layout and narrow-screen overflow
The extension detail view led with a page-level reload button and sat the
back button beside it 3px off: the two flowed inline and aligned by
baseline, which the back button takes from its icon. It also kept a
directory search that filters nothing there, a heading close to the page
title, and status copy that read like body text. On narrow screens the tab
strip widened the whole page, leaving a horizontal scrollbar.
Lead with the back button and move reload to the opposite end, drop the
search from the detail view, and give the detail an icon, package name and
a status notice holding the installation guide. On the directory, reload
now sits beside the hint that explains it. The tab strip scrolls inside
itself and keeps the active tab in view, and reload collapses to an icon
below `sm` with its accessible name intact.
No copy changes.
* fix(capabilities): realign the tab strip on resize without moving the page
Review follow-up. The active tab was only realigned when the tab changed, so
a rotation or window resize could leave it clipped. Realign whenever the strip
resizes, and leave manual swipes alone.
Scroll only the strip. scrollIntoView would also move the page, pulling it back
up when a resize arrives after the user has scrolled past the strip.
Also hide the strip's scrollbar in browsers without scrollbar-width support,
and find the page scroller in the E2E test by computed style rather than by a
class name.
