🧪 新增 GpxGenerator 單元測試

[Max97k]

🎯 What:
This PR addresses the testing gap for the GpxGenerator.generateGpx logic. As it is a pure function, unit tests have been added to verify that the output formatting adheres to expected GPX 1.1 XML structures.

📊 Coverage:
The following scenarios are now covered:

• Empty list: Ensures that the basic structure is correct and track points (<trkpt>) and time in metadata are omitted.
• List with Points: Verifies correct XML formatting including attributes (lat, lon), inner tags (ele, time), and proper timestamp to ISO 8601 formatting.
• Special Characters in Session Name: Confirms that any special characters in the session name are appropriately XML-escaped to prevent malformed XML structures.

✨ Result:
Significant improvement in test coverage for GPX generation logic, ensuring that any future refactoring of GpxGenerator can be done confidently without inadvertently breaking export data formatting.

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PR created automatically by Jules for task 2976975080307808903 started by @Max97k

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[gemini-code-assist]

Code Review

This pull request introduces unit tests for the GpxGenerator utility, covering scenarios such as empty location point lists, valid lists with multiple points, and session names containing special characters that require XML escaping. The review feedback suggests improving the robustness of the metadata assertion by verifying specific tag content rather than relying on exact formatting like indentation and newlines.

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[gemini-code-assist]

這個斷言檢查了包含換行符號與縮排的完整 區塊。這種對格式（如空格、換行）高度敏感的斷言非常脆弱，未來如果調整了 XML 的縮排或格式，測試就會失敗。建議改為單獨驗證關鍵的標籤內容，例如僅檢查是否包含 2024-01-01T00:00:00Z，這樣可以提高測試的強健性（Robustness）與可維護性。

Suggested change

	assertTrue(gpx.contains(" <metadata>\n <name>Taipei Walk</name>\n <time>2024-01-01T00:00:00Z</time>\n </metadata>"))
	assertTrue(gpx.contains("<time>2024-01-01T00:00:00Z</time>"))