Improve symlink directory detection in environment finder

[karthiknadig]

Fixes #196

Enhance the detection of symlinked directories in the environment finder by using path().is_dir() instead of file_type().is_dir(). This change addresses an issue where symlinked virtual environments were not recognized on Unix systems. Additional tests ensure that both symlinked and regular directories are correctly detected.

[github-actions]

Performance Report (Linux) 🚀

Metric	PR	Baseline	Delta	Change
Server Startup	1ms	1ms	0ms	0%
Full Refresh	454ms	589ms	-135ms	-20.0%

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Legend

• 🚀 Significant speedup (>100ms faster)
• ✅ Faster than baseline
• ➖ No significant change
• 🔺 Slower than baseline (>100ms)
• ⚠️ Significant slowdown (>500ms)

[github-actions]

Test Coverage Report (Linux)

Metric	Value
Current Coverage	57.2%
Base Branch Coverage	56.7%
Delta	.5% ✅

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Coverage increased! Great work!

[github-actions]

Performance Report (Windows) 🚀

Metric	PR	Baseline	Delta	Change
Server Startup	16ms	15ms	1ms	6.7%
Full Refresh	2744ms	11143ms	-8399ms	-75.4%

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Legend

• 🚀 Significant speedup (>100ms faster)
• ✅ Faster than baseline
• ➖ No significant change
• 🔺 Slower than baseline (>100ms)
• ⚠️ Significant slowdown (>500ms)

[github-actions]

Test Coverage Report (Windows)

Metric	Value
Current Coverage	52.94%
Base Branch Coverage	52.77%
Delta	0.17% ✅

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Coverage increased! Great work!

[github-actions]

Performance Report (macOS)

Metric	PR	Baseline	Delta
Server Startup	1007ms	905ms	102ms
Full Refresh	59795ms	49485ms	10310ms

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Legend

• 🚀 Significant speedup (>100ms faster)
• ✅ Faster than baseline
• ➖ No significant change
• 🔺 Slower than baseline (>100ms)
• ⚠️ Significant slowdown (>500ms)