docs: Create Chrome Web Store promotional screenshots (1280x800)

[ajithakdev]

Summary

Design and create 5 annotated promotional screenshots for the Chrome Web Store listing.

Required screenshots (1280x800px each)

1. Main popup with test results — Headline: "One-Click Speed Test"
2. Use-case readiness labels — Headline: "Know If Zoom Will Work"
3. PDF report export — Headline: "Professional ISP Reports"
4. Side panel dashboard — Headline: "Always-On Dashboard"
5. Settings/options page — Headline: "Your Server, Your Rules"

Design guidelines

• Dark background matching MeterX theme
• Extension screenshot centered with ample padding
• Bold headline text above the screenshot
• Subtle feature callouts with arrows or highlights
• Consistent visual style across all 5 images

Why

• CWS listings with all 5 screenshot slots filled convert significantly higher
• Screenshots are the Dev/v2025.2.0 #1 factor in install conversion after title/icon
• Currently MeterX has no optimized screenshots