docs: re-target mobile search-input margin at the 2.x sibling DOMclaude/datatables-2x-upgrade

DataTables 1.x nested the search <input> inside its <label>; 2.x renders them
as siblings inside div.dt-search, so the narrow-viewport descendant rule
'label input' no longer matched and the 10px top margin was silently lost
below 576px. Target '.dt-search input' instead. Flagged independently by the
implementation pass and both adversarial reviewers (Codex + agy).

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