The header and footer stay in place while panel-main scrolls. Useful for long-form content with persistent context (filter chips above, action buttons below).

Row 1 — placeholder content.

Row 2 — placeholder content.

Row 3 — placeholder content.

Row 4 — placeholder content.

Row 5 — placeholder content.

Row 6 — placeholder content.

Row 7 — placeholder content.

Row 8 — placeholder content.