lock search input in share view, dashed-border readonly style
share view recipients can no longer type new queries. the search box is
pre-populated with the shared query and set readonly, so the recipient
sees the specific result the sharer meant to share rather than
accidentally getting a browseable interface over the target's whole
repo. the underlying PDS records are public either way (and the sharer
accepted that when they clicked save), but the share modal copy
promises "this query" — the UI should honor that. a recipient who wants
to search freely can sign in with their own handle.
visual: dashed border + muted text + transparent fill so it reads as
"fixed, not editable" without looking disabled. readonly (not disabled)
keeps select + copy working.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>