Fix SNR formatting in RX wardriving API payload

[Copilot]

The RX wardriving function was submitting negative SNR values and rounding to integers instead of using absolute values with decimal precision.

Changes

• content/wardrive.js: Changed SNR formatting from Math.round(entry.snr_avg) to Math.abs(entry.snr_avg).toFixed(1) in queueApiPost()
• docs/FLOW_WARDRIVE_RX_DIAGRAM.md: Updated examples to reflect new format

Before/After

// Before: negative values and integer rounding
const heardRepeats = `${entry.repeater_id}(${Math.round(entry.snr_avg)})`;
// "heard_repeats": "7b(-8)"

// After: absolute value with one decimal place
const heardRepeats = `${entry.repeater_id}(${Math.abs(entry.snr_avg).toFixed(1)})`;
// "heard_repeats": "7b(8.0)"

Original prompt

The RX Wardriving function we just implemented seems to be rounding SNR before submitting it to API. -8 should alwasy read 8.0

[RX BATCH API] Payload: {
"key": "59C7754DABDF5C11CA5F5D8368F89",
"lat": 45.26969140877898,
"lon": -75.77747208706617,
"who": "MrAlders0n",
"power": "1.0w",
"heard_repeats": "7b(-8)",
"ver": "DEV-1766430122",
"test": 0,
"iata": "YOW",
"session_id": "20251222-0035",
"WARDRIVE_TYPE": "RX"
}

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