Added support for symlinks and directories

[harshalranjhani]

Fixes #29

Summary

Adds support for directories and symbolic links to the add command with user-controlled flags for recursive traversal and hidden file inclusion.

New Flags

--recursive / -r: Recursively add directories (default: false)
--include-hidden / -H: Include hidden files/directories (default: false)

Changes

1. Helper Functions (internal/fs/helper.go)

• Added PathType enum (File, Dir, Symlink, Other)
• GetPathInfo(): Detects path type without following symlinks
• ResolveSymlink(): Resolves symlinks to their targets
• ShouldSkipHidden(): Filters hidden files based on flag

2. Add Command (cmd/add.go)

• expandDirectories(): Expands directories into file pairs when --recursive is set
• Walks directory tree using filepath.WalkDir()
• Preserves directory structure in destination paths
• Applies hidden file filtering based on --include-hidden
• Updated processing loop to handle symlinks:
  • Resolves symlinks to files and stores target content
  • Rejects symlinks to directories
  • Fixed Windows symlink test compatibility

3. Tests (internal/fs/helper_test.go)

• Added tests for GetPathInfo, ResolveSymlink, ShouldSkipHidden

[codecov]

Codecov Report

❌ Patch coverage is 22.90076% with 101 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
cmd/add.go	2.06%	95 Missing ⚠️
internal/fs/helper.go	82.35%	5 Missing and 1 partial ⚠️

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