Add repeater echo tracking to session ping logs

[Copilot]

Session pings now capture which repeaters relay each message by listening to LogRxData events for 7 seconds post-ping, extracting repeater IDs and SNR values from packet paths.

Implementation

• Added LogRxData event listener that parses GRP_TXT packets for repeater telemetry
• Extracts repeater ID from first byte of packet path with validation (0-255, integer)
• Tracks SNR values (-12 to +12 dB), keeping highest value for duplicate repeaters
• Appends formatted repeater list to session log entry after 7-second collection window
• Changed timestamp format to ISO 8601 without milliseconds

Example output

2025-12-18T14:32:45Z  47.79400  -3.42800  [25(-8),21(-5),14(3)]

Error handling

• Packet parsing failures caught and logged without breaking listener
• Input validation for SNR type and repeater ID range
• Null checks prevent race conditions if tracking stops mid-collection
• Cleanup on disconnect removes listeners and timers

Original prompt

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This section details on the original issue you should resolve

<issue_title>[Feature]: Session Ping Echo Repeater Tracker</issue_title>
<issue_description>### What feature do you want?

Add the ability to track and display which repeaters receive and relay session ping messages. After each ping, continuously listen to the rx_log stream for 7 seconds to detect all echo responses from repeaters. Extract and log each repeater's ID and SNR, then append this repeater telemetry to the session ping output in the following 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)]

Why do you need it?

This feature improves real-time situational awareness and network diagnostics by showing which repeaters actively received and relayed a ping. It helps users assess current repeater coverage, verify field network health, and troubleshoot link reliability.

How important is this?

Medium - Nice to have

Anything else?

No response</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes MrAlders0n/MeshCore-GOME-WarDriver#33

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