feat: "Router Reboot Reminder" — gentle nudge when quality degrades over days

[ajithakdev]

Summary

Track connection quality trends and suggest a router reboot when performance has been gradually degrading over several days.

The insight

Most non-technical users don't know that simply restarting their router can fix 70%+ of connection issues. Routers accumulate memory leaks, stale DNS caches, and connection table overflow over weeks of uptime.

How it works

1. Analyze last 7 days of test history
2. Detect if quality has been trending downward (e.g., health score dropped 15+ points)
3. Show gentle suggestion:

💡 Your WiFi quality has been declining for 5 days.
   A simple router reboot often fixes this!
   
   How: Unplug your router → wait 30 seconds → plug back in
   
   [Remind me later]  [I did it — retest!]

4. If user clicks "I did it — retest!", run a new test and show before/after comparison
5. "Latency improved from 85ms to 14ms! 🎉 Router reboot worked!"

Why

• Incredibly practical for non-technical users
• Teaches good habits (regular router maintenance)
• Shows MeterX genuinely helps, not just measures
• No other speed test extension does this
• Before/after comparison makes the value immediately visible

Implementation

• Analyze history trend in analytics.ts
• Show suggestion as a dismissible banner in popup
• Store last reboot reminder timestamp to avoid nagging
• Track pre/post reboot metrics for comparison