fix: packet monitor uses server time for consistent ordering

[Yeraze]

Summary

• Incoming packets in the packet monitor used meshPacket.rxTime (device clock) for timestamps, while outgoing packets used Date.now() (server clock)
• When the connected device's clock drifts even slightly from the server, this causes responses to appear before their requests in the packet monitor
• Now both incoming and outgoing packets use server time consistently
• The original rxTime is still preserved in packet metadata (rx_time) for debugging

Addresses timing comments in #2364

Test Plan

• npx vitest run — 3070 tests pass, 0 failures
• npm run build — no TypeScript errors

🤖 Generated with Claude Code

[github-actions]

Claude finished @Yeraze's task —— View job

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PR Review Analysis

Completed analysis of the timestamp consistency fix. This is a well-targeted improvement that addresses a real timing issue in the packet monitor.

Todo List:

• Read and analyze the changed file
• Review code quality and best practices
• Check for potential bugs or issues
• Assess performance considerations
• Evaluate security concerns
• Review test coverage adequacy

Review Findings

✅ Code Quality & Best Practices

• Clean, focused change: Single-line fix with clear intent and good commenting
• Consistent with existing patterns: Uses the same Math.floor(Date.now() / 1000) pattern already used for outgoing packets at src/server/meshtasticManager.ts:3627
• Good commenting: The inline comment explains both the "why" and notes that rxTime is preserved in metadata
• Preserves data integrity: Original rxTime is still accessible in metadata.rx_time for debugging purposes

✅ Bug Analysis

• Addresses real timing issue: Clock drift between device and server can cause responses to appear before requests in the packet monitor
• No regression risk: Change is conservative and maintains backward compatibility
• Consistent behavior: Both incoming and outgoing packets now use the same time source

✅ Performance Considerations

• Minimal performance impact: Date.now() is already being called; just removing conditional logic
• Slightly better performance: Eliminates conditional check on meshPacket.rxTime

✅ Security Concerns

• No security implications: Time source change doesn't introduce any security risks
• Data preservation: Original timing data remains available for forensic analysis if needed

✅ Test Coverage

• Tests passing: All 3070 tests pass with 0 failures
• Build clean: No TypeScript compilation errors
• Adequate coverage: This change affects data logging behavior that's already covered by existing packet logging tests

Summary

This is an excellent fix that:

1. Solves a real problem: Eliminates timing inconsistencies in packet monitor display
2. Uses minimal code change: Single line modification with clear intent
3. Maintains data integrity: Preserves original timing data for debugging
4. Follows existing patterns: Consistent with outgoing packet timestamp handling
5. Has comprehensive testing: All tests pass confirming no regressions

Recommendation: ✅ APPROVE - This is a well-implemented fix that addresses the timing issue described in #2364 without any apparent downsides.