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etui/widgets/block — Borders, title, padding — foundation for panels.

╭─ Title ───────╮
│               │
│   content     │
│               │
╰───────────────╯

let blk =
  block.block_new()
  |> block.with_border(block.Rounded)
  |> block.with_title("Title", block.Top)

buffer.buffer_new(screen)
|> block.render(area, blk)
|> paragraph.render(block.inner(area, blk), para)