[fix] Always scan selected root even if hidden/system

[paul-fresquet]

Summary:

• Ensure inventory always scans the selected root path even when Hidden/System filters are enabled, while preserving child filtering.
• Add unit tests to assert hidden/system child files are ignored, plus integration coverage for hidden root directories (Windows, Linux, macOS).

Implementation details:

• Compare normalized paths to detect the selected root and bypass hidden/system checks only at that level.
• Keep reparse/offline/exists checks unchanged.

[sonarqubecloud]

Quality Gate passed

Issues
5 New issues
0 Accepted issues

Measures
0 Security Hotspots
96.7% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[Copilot]

Pull request overview

This PR fixes an issue where inventory scanning would skip the selected root directory or file when Hidden/System file filters were enabled. The fix ensures that the root path specified by the user is always scanned, while still applying filters to child items.

Key changes:

• Added path normalization and root detection logic to bypass Hidden/System filters at the root level only
• Enhanced unit tests to verify both root and child filtering behavior
• Added integration tests for hidden root directories on Windows, Linux, and macOS

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 3 comments.

File	Description
src/ByteSync.Client/Services/Inventories/InventoryBuilder.cs	Added IsRootPath() and NormalizePath() methods; modified file and directory analysis to skip Hidden/System checks for root paths
tests/ByteSync.Client.UnitTests/Services/Inventories/InventoryBuilderInspectorTests.cs	Renamed and enhanced existing tests for root files; added tests for root directories and child file filtering
tests/ByteSync.Client.IntegrationTests/Services/Inventories/TestInventoryBuilder.cs	Added platform-specific integration tests for hidden root directories

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