Closes#4533 (partly at least)
Release Notes:
- Added `project_panel.sort_mode` option to control explorer file sort
(directories first, mixed, files first)
## Summary
Adds three sorting modes for the project panel to give users more
control over how files and directories are displayed:
- **`directories_first`** (default): Current behaviour - directories
grouped before files
- **`mixed`**: Files and directories sorted together alphabetically
- **`files_first`**: filed grouped before directories
## Motivation
Users coming from different editors and file managers have different
expectations for file sorting. Some prefer directories grouped at the
top (traditional), while others prefer the macOS Finder-style mixed
sorting where "Apple1/", "apple2.tsx" and "Apple3/" appear
alphabetically mixed together.
### Screenshots
New sort options in settings:
<img width="515" height="160" alt="image"
src="https://github.com/user-attachments/assets/8f4e6668-6989-4881-a9bd-ed1f4f0beb40"
/>
Directories first | Mixed | Files first
-------------|-----|-----
<img width="328" height="888" alt="image"
src="https://github.com/user-attachments/assets/308e5c7a-6e6a-46ba-813d-6e268222925c"
/> | <img width="327" height="891" alt="image"
src="https://github.com/user-attachments/assets/8274d8ca-b60f-456e-be36-e35a3259483c"
/> | <img width="328" height="890" alt="image"
src="https://github.com/user-attachments/assets/3c3b1332-cf08-4eaf-9bed-527c00b41529"
/>
### Agent usage
Copilot-cli/claude-code/codex-cli helped out a lot. I'm not from a rust
background, but really wanted this solved, and it gave me a chance to
play with some of the coding agents I'm not permitted to use for work
stuff
---------
Co-authored-by: Smit Barmase <heysmitbarmase@gmail.com>
a2d3e3baf9