fix(core): treat symlink-to-directory as directory type

[vanhci]

Description

Symlinked directories (Linux ln -s) and Windows junction points (e.g., OneDrive Desktop) were classified as 'symlink' because Node's isDirectory() returns false for reparse points. The downstream filter in file/index.ts skips entries with type !== 'directory', causing symlinked directories to be invisible in the directory picker and @file picker.

Root Cause

packages/core/src/filesystem.ts:74 — readDirectoryEntries classifies symlinks and junction points as 'symlink' because e.isDirectory() returns false for reparse points. The check order was: isDirectory ? directory : isSymbolicLink ? symlink : isFile ? file : other.

Fix

Check isDirectory() for symlinks first to determine if the target is a directory:

// Before
type: e.isDirectory() ? "directory" : e.isSymbolicLink() ? "symlink" : e.isFile() ? "file" : "other"

// After  
type: e.isSymbolicLink() ? (e.isDirectory() ? "directory" : "symlink") : e.isDirectory() ? "directory" : e.isFile() ? "file" : "other"

Fixes #28526

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[github-actions]

The following comment was made by an LLM, it may be inaccurate:

Potential Duplicate Found

PR #28529: fix(filesystem): resolve symlink/junction targets to directory type
#28529

This PR appears to be addressing the exact same issue as PR #28531. Both PRs:

• Fix symlink/junction point directory classification in the filesystem module
• Target the same root cause: isDirectory() returning false for reparse points
• Aim to make symlinked directories visible in file/directory pickers

Recommendation: Check if PR #28529 is already merged or if one should be closed in favor of the other.

[danielxxomg]

Hey, thanks for taking a stab at this! Quick note — e.isDirectory() returns false for Windows junction points (reparse points like OneDrive Desktop). Your ternary won't resolve those because isDirectory() doesn't follow the link on Windows.

The fix in #28532 uses NFS.stat(join(dirPath, e.name)) to actually follow the link and check the target type, which works on Linux symlinks, Windows junctions, and macOS aliases.

Want to close this in favor of #28532? It covers all platforms.

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