fix!: Frecency conflicts (sorry, this will delete all your history)

[dmtrKovalenko]

No description provided.

[Copilot]

Pull Request Overview

This PR refactors the frecency tracking system by removing the FileKey abstraction and simplifying file access tracking to work directly with file paths. The change improves the API design by using native path types and adds better error handling for invalid paths.

• Removes the FileKey wrapper struct and uses Path/PathBuf directly
• Renames access_file to track_access for better clarity
• Adds path canonicalization and validation with proper error handling

Reviewed Changes

Copilot reviewed 8 out of 8 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
lua/fff/rust/lib.rs	Updates function signature and removes FileKey usage in track_access
lua/fff/rust/frecency.rs	Refactors to use Path directly and adds path validation
lua/fff/rust/file_picker.rs	Removes FileKey conversion methods and updates to use paths directly
lua/fff/rust/file_key.rs	Completely removes the FileKey struct
lua/fff/picker_ui.lua	Removes old access_file call (logic moved elsewhere)
lua/fff/main.lua	Updates to use async file operations and new track_access function
lua/fff/fuzzy.lua	Updates exported function name from access_file to track_access
lua/fff/file_picker/init.lua	Renames function and adds debug print statement

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