[implexrr]

• Stabilize the URL form during scanning, keep the last report while editing the URL, and make View report scroll smoothly with reduced-motion support.
• Bring vision presets closer to the snapshots, preserve the comparison position on mobile, and move advanced controls into a disclosure.
• Surface report exports, simplify the findings layout, and distinguish URL validation from scan failures.

Validation: 142 local tests, production frontend build, controlled Chrome fixture checks, and the npm production/development dependency audit passed.