feat(web): add select page action

[tony027wh]

Summary

• add a bulk-action button to select all items on the current page
• wire selection logic to update selected state and counts
• add i18n strings for the new button in English and Chinese

Testing

• bun run build

[tickernelz]

Clean and simple implementation. Thanks!

One UX issue: the "Select Page" button is placed inside #bulk-actions which is hidden by default and only shows after at least one item is selected. This means users can't discover the "Select Page" button until they manually check one item first — which defeats the purpose of a "select all" action.

Suggestion: Move the "Select Page" button outside of #bulk-actions, or make it always visible alongside the existing toolbar buttons. The "Deselect All" and "Delete Selected" can stay inside bulk-actions since those make sense post-selection.

Once fixed, this is ready to merge.

[tickernelz]

Approved. The UX button placement is minor — can be fixed in a follow-up.