🧪 Add edge case test for GpxGenerator empty list

[Max97k]

🎯 What: This PR addresses a testing gap where the GpxGenerator edge case of receiving an empty list was not covered.
📊 Coverage: The new test ensures that GpxGenerator.generateGpx() correctly returns base GPX XML with metadata but without <time> and <trkpt> tags when given an empty list. It also verifies that passing an empty list does not cause runtime errors.
✨ Result: Test coverage for GpxGenerator edge cases has been improved. This increases code reliability and allows us to refactor GpxGenerator with confidence.

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PR created automatically by Jules for task 16309271583450713155 started by @Max97k

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[gemini-code-assist]

Code Review

This pull request adds a new unit test file, GpxGeneratorTest.kt, containing a test case to verify that GpxGenerator.generateGpx returns a valid base XML structure when given an empty list of location points. I have no feedback to provide.

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