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In HA hp-dialog renders ha-dialog, whose own `.body` is the scroller and is not a flex container; `.summary-editor` (overflow:auto, overscroll-behavior:contain, min-height:0) therefore grew to its content and became a scroll container that never scrolls — Chromium stops wheel and touch scroll chaining at such a child, so nothing moved (reproduced on ha.jbstudio.pro, HA 2026.9.1, and in an isolated Playwright page). hp-dialog gains an opt-in `flex-content` attribute forwarded as ha-dialog's `flexcontent`, which lays the body out as a flex column: the editor is height-bound again and scrolls itself, header and footer stay, exactly as the native branch already did. Only the summary dialog opts in. Smoke demo/smoke_summary_dialog_scroll.mjs stubs ha-dialog after the HA 2026.9 contract: wheel on desktop, touch swipe on a phone, dialog within the viewport, and a witness that the stub reproduces the bug without flexcontent. Docs screenshots: 11/11 pixel-identical (docs:accept --identical, #512), fingerprint refreshed. Mutants: summary-dialog-drops-flex-content, hp-dialog-ignores-flex-content. Issue: #508 User-Visible: yes