Add more accessibility test cases to mock data

[ieliofficial]

The current mockScanResults.js only has 4 problems total (2 visual, 2 structure, 1 multimedia). To make the demo more realistic and useful, we need more comprehensive examples.

Requirements: Add problems in these categories:

• Forms: Missing labels, incorrect ARIA, required fields not marked
• Keyboard: Tab order issues, trap focus, missing skip links
• ARIA: Incorrect role usage, live regions, dynamic content announcements
• Color: Color as only indicator of state, contrast for large text
• Motion: No respect for prefers-reduced-motion

Test data format: Follow the existing structure in mockScanResults.js