What needs you: older browsers keep every ask; on a phone a grouped row is its head line #926

Follow-ups to #910, from product-reviewer-2's verdict and the lead's call.

1. Older browsers keep every ask reachable. The rules that hide a summary and hold its details open now sit inside @supports selector(::details-content). In a browser without that selector (Safari before 18.4, Firefox before 143), both "N more" toggles stay as ordinary tap-to-open sections.
2. The fold wins (lead's decision). On a phone, a grouped ask row ("3 green changes wait for your look") shows its head line, the select-all box and the consequence line. Its changes sit behind "Show all N". A wider screen holds that details element open, so desktop is unchanged. This also sits inside the @supports guard.

Measured with the reviewer's fixture (Chromium): 7 asks, the top two being groups of 3 and 2 changes, with the admin-only everyday-account card hidden.

• 390×844: the section is 463 px (the reviewer measured 719) and the composer starts at 609 px, above the 844 px fold. Tapping "Show all 3" shows the three changes in place.
• 1280: the group rows show every line and there are five cards plus "2 more", the same as before.

Removed: nothing. rowCard uses card with a details element in place of listCard.

Tests:

• asks-rank's cap test checks that both summary-hiding rules sit inside the @supports block.
• "a collapsed row that ranks for security…" now also checks the ask-group details element, its "Show all 2" summary, and the wide-screen rule that holds it open.
• tsc is clean; asks*, home-feed, studio and the five cross files give 302 pass.

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