Converts the "Open full page" control in the detail drawer header from an
icon-only link into a text+icon button using the standard
`secondary outline small` classes. Because the base button rule in
app-shell.css only targets `button, [type=…], [role=button]`, the anchor
gets `role="button"` so the core cascade applies (border-radius, padding,
hover/focus states). Component-local CSS is trimmed to just the flex
layout (icon + label with gap) and text-decoration reset — border, radius
and colors come from the shared button base.
Tooltip is removed (redundant with visible text); aria-label remains for
screen readers.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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