feat(perf): add loading='lazy' to image tags for deferred loading (#4007) #4033

Problem

Many image tags in dashboard components load eagerly even when off-screen.

Solution

• Add loading='lazy' to all <img> tags in:
  • Analytics dashboard image charts
  • Report preview thumbnails
  • Knowledge base document previews
  • User avatar images
  • Screenshot galleries

Impact

• 30-60ms per-page load savings
• Reduced initial bandwidth usage
• Better performance on slow networks