Fix responsive Markdown table layout in chat output

[dovvnloading]

What changed

• Wrap rendered Markdown tables in a horizontally scrollable container.
• Keep the first column at a readable width and only break genuinely long tokens inside cells.
• Add a screenshot-sized Playwright regression covering column sizing and page overflow.

Root cause

The chat-wide overflow-wrap: anywhere rule was inherited by table cells. With the browser's automatic table layout, that made the first column's min-content width collapse and split ordinary words such as Aspect and Shape.

Validation

• npm.cmd run lint
• npm.cmd run typecheck
• npm.cmd run test -- --run
• npm.cmd run e2e -- --workers=1
• npm.cmd run build