Give the in-pool file selection the same action set as the files grid.
SelectionBar is now driven by props (count + callbacks) instead of reading
the selection store directly, with an optional "Remove from pool" action.
The pool page uses it to offer Edit tags, Add to pool, Mark reviewed,
Remove from pool and Delete (to trash), replacing the previous
add/remove-only bar.
Also rename the content_datetime label from the photo-centric "Date taken"
to "Content date" across the files sort, the file viewer field and the pool
sort options (and align the pool's "created" option with the files grid).
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
H1K0
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