Surface parse errors instead of silently discarding them

[bamnet-bot]

Fixes #14

• Adds ParseError type with Field, Value, and underlying error
• Adds ParseErrors []error field to Train, StationTrain, and StationStop structs
• Collects parse errors from time and coordinate parsing instead of silently discarding
• Includes tests verifying parse errors are surfaced for StationData and VehicleData

[gemini-code-assist]

Code Review

This pull request introduces a custom ParseError type and updates the client to capture and expose parsing errors for dates, times, and coordinates within the StationTrain, StationStop, and Train structs, rather than silently ignoring them. Unit tests have also been added to verify this new error-handling behavior. The feedback points out that in vehicle_data.go, the error check for parseLatLng is deferred until after the Train struct initialization, which is non-idiomatic in Go and should be handled immediately after the function call.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 88.25%. Comparing base (8371954) to head (8084561).

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #24      +/-   ##
==========================================
+ Coverage   85.91%   88.25%   +2.34%     
==========================================
  Files           5        5              
  Lines         291      349      +58     
==========================================
+ Hits          250      308      +58     
  Misses         24       24              
  Partials       17       17              

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