Let query forms grow with their content

[bt1142msstate]

Summary

• remove the 240px form-card height cap and nested vertical scrolling
• let both combined and Form-only workspaces expand with their fields
• keep the page as the vertical scroll surface
• add browser coverage that rejects nested form scrollbars and requires document growth

Verification

• cache manifest current
• ESLint passes for the browser regression test
• local broad browser run is currently blocked earlier by the existing intermittent dark-theme surface assertion