HTML table generator

Turns pasted CSV into a proper HTML table with `thead` and `tbody`, every cell escaped, and an optional wrapper that scrolls sideways when the table is wider than its column.

Escaping is the reason to generate rather than hand-write. A cell containing `<`, `&` or a quote produces broken markup when pasted straight in, and the failure is silent — the browser recovers, the page renders, and one cell has quietly eaten the rest of the row. The `thead` and `tbody` split is not decoration. A screen reader uses `th` elements to announce which column a cell belongs to as the user moves through the table, so a table built entirely from `td` is navigable only by someone who can see it. `thead` also lets the browser repeat the header when a table breaks across printed pages. The scrolling wrapper solves the layout problem every wide table has: a table will not shrink below the width of its content, so a wide one pushes the whole page sideways. Wrapping it in a block with `overflow-x: auto` confines the scroll to the table, which is what this site does with its own article tables.