This fixes spreadsheet filter side panels so they continue to open and collapse correctly after an internal naming change. It helps avoid small interface issues when users edit global filters in spreadsheets.

`collapsedAtInit` has been renamed to `isInitiallyCollapsed`

This fix makes an automated rental checkout test update date inputs more reliably. It helps prevent intermittent build warnings, improving confidence in release checks without changing the customer-facing shopping experience.

Before this commit, we had a non-deterministic warning on some runbot builds: see "shop_buy_rental_product" tour.

This is because we set the new value via the daterange picker and we need to trigger an "enter" event to force an input update.

runbot error: 161483
Related PR #82005