fix: avoid startup crash when saved appdata path is unavailable

[nickogl]

Purpose of this PR:

WheelWizard could crash on startup at logger initialization when a previously saved custom data folder points to an unavailable path (for example after external drive letter changes). This PR fixes the root cause by making appdata-path resolution resilient.

How to Test:

• Set HKCU\Software\WheelWizard\AppDataLocation to a path on an unavailable drive (for example Z:\... where Z: does not exist).
• Start WheelWizard.
• Confirm startup no longer crashes due to missing appdata path.

What Has Been Changed:

• PathManager now ignores persisted custom appdata paths that cannot be created/accessed and falls back to default appdata path for startup.
• Added a regression test for unavailable target-path behavior via public PathManager API.

Checklist before merging

• You have created relevant tests

Discussion points

Logger initialization failures did not surface anywhere but the Windows event logs (at least for me), which makes diagnosis harder for end users. A follow-up improvement could be either to add a fallback sink or improve the way this error surfaces to the end user.

Summary by CodeRabbit

• Tests

  • Added tests for appdata path validation to ensure proper error handling when paths are unavailable.

• Bug Fixes

  • Enhanced appdata path validation with improved error reporting and accessibility checks.

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📝 Walkthrough

Walkthrough

A new appdata path validation layer is added to PathManager that normalizes persisted paths, filters default values, and validates directory accessibility through a helper method. A Windows-only test ensures unavailable network paths are properly rejected with error reporting.

Changes

Appdata Path Validation with Accessibility Checking

Layer / File(s)	Summary
Appdata path accessibility validation WheelWizard/Services/PathManager.cs	LoadSavedWheelWizardAppdataOverride normalizes the persisted override path, compares it against the default to filter equivalents, and validates directory accessibility via a new private helper TryEnsureWheelWizardAppdataPathAccessible that wraps directory-ensure operations with exception handling.
Unavailable path rejection test WheelWizard.Test/Features/Settings/PathManagerTests.cs	A Windows-only xUnit test verifies that TrySetWheelWizardAppdataPath returns false and provides a non-empty error message when attempting to set an appdata path to an unavailable UNC network location.

🎯 2 (Simple) | ⏱️ ~12 minutes

🐰 A path's been smoothed with safety in mind,
Normalize, compare, ensure paths aligned,
When networks are slow or simply not there,
WheelWizard checks twice and handles with care! ✨

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and concisely summarizes the main change: fixing a startup crash by making appdata path resolution resilient to unavailable paths.
Description check	✅ Passed	The description covers all required template sections with sufficient detail and marks the test checklist as complete.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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Actionable comments posted: 1

🤖 Prompt for all review comments with AI agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Inline comments:
In `@WheelWizard.Test/Features/Settings/PathManagerTests.cs`:
- Around line 21-24: GetUnavailableWindowsPath currently returns a UNC host path
which can hang on DNS resolution; change it to return a deterministic unused
local drive-letter path so failures are immediate. Update the
GetUnavailableWindowsPath method to return a path like
$@"Z:\WheelWizardTests\{Guid.NewGuid():N}" (or better: pick an unused drive
letter by checking DriveInfo.GetDrives() and return the first free letter)
instead of the UNC \\nonexistent-host\... value.

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Fix all unresolved CodeRabbit comments on this PR:

• Push a commit to this branch (recommended)
• Create a new PR with the fixes

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

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Run ID: a6d359d4-6869-4a86-99df-0ee15a9eff84

📥 Commits

Reviewing files that changed from the base of the PR and between 33a59db and d2f97fd.

📒 Files selected for processing (2)

• WheelWizard.Test/Features/Settings/PathManagerTests.cs
• WheelWizard/Services/PathManager.cs