Block sync for incompatible vault paths

[algiadev8]

Problem

macOS allows users to create file and folder paths that cannot be applied on Windows.

Previously, these paths could be added to sync, causing errors when a Windows client attempted to apply them.

Summary

• Prevented paths incompatible with supported platforms from being synced
• Blocked incompatible local paths before upload
• Prevented incompatible remote paths from being applied to the local vault
• Made blocked files visible in the File Explorer and sync settings
• Updated the existing File Explorer and sync setting tooltip to show guidance specific to incompatible paths

Details

• Added portable path validation for Windows-incompatible characters, reserved device names, trailing spaces and dots, and other invalid path components
• Added incompatible_path as a blocked reason
• Renamed the blocked-file API to listBlockedSyncFiles()
• Retained the previous listFileSizeBlockedFiles() API and related types as deprecated aliases for backward compatibility
• Updated File Explorer warning tooltips to explain incompatible paths
• Updated sync settings to report file-size and incompatible-path blocks separately
• Added the new UI messages to all supported locales
• Preserved path whitespace in encrypted metadata so trailing spaces can be detected instead of silently changing the path

Validation

• Verified with a real vault that paths containing characters such as || are blocked and not synced

[hhhjin]

@codex review

[chatgpt-codex-connector]

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[hhhjin]

great work, thanks for the pr!