Commit double-tap entry editing

Summary

Reviewed the feat/android branch, distinguishing its existing Android WebView shell commit from uncommitted frontend changes. Committed the existing entry-editing changes as 5ca8e85 (fix(lists): require double-tap to edit entries): frontend/src/ListPage.tsx used DoubleTapButton instead of single-click editing and added a double-tap hint; frontend/src/index.css changed the entry cursor from text to default and updated its comment. The commit succeeded, and the session ended with a clean working tree, one commit ahead of the remote, without pushing. Verification was limited to Git diff and status inspection; no build, automated tests, or interactive checks were recorded.