[WIP] Enhance session ping functionality to track repeaters

[Copilot]

Thanks for asking me to work on this. I will get started on it and keep this PR's description up to date as I form a plan and make progress.

Original prompt

Session Ping Repeater Echo Tracker

Purpose: Enhance session ping functionality to identify which repeaters heard and relayed your ping messages.

Functionality:

• Listen to the rx_log stream for 7 seconds after each ping transmission to capture channel echoes
• Track and log each repeater that received and relayed the message, along with the signal-to-noise ratio (SNR)
• Display repeater telemetry alongside your location data in session pings

Output Format:
${nowStr} ${lat. toFixed(5)},${lon.toFixed(5)} [RepeaterID-1(-SNR),RepeaterID-2(-SNR),...]

Example:
2025-12-18T14:32:45Z 47.79400,-3.42800 [25(-112),21(-109)]

Implementation Approach

Key Steps:

1. Hook into RX_LOG stream - Listen for incoming messages after ping transmission
2. Echo detection - Filter for messages that are echoes (repeater relays) of your sent message
3. Data collection - Capture Repeater ID and SNR from each echo
4. Time-bounded listening - Listen for 7 seconds, then compile results
5. Format and display - Append repeater info to your location ping format

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