ci: migrate project automation to Just (#442)

* ci: migrate project automation to Just

Centralize build, test, release, dependency, hook, and website commands in Just recipes. Pin workflow tooling, use the repository toolchain, and run the complete validation set in CI.

* ci: codex being codex

* docs: update CLAUDE.md for just task runner migration

Reflect the switch to just recipes for build/test/clippy/fmt, note
dprint replacing raw rustfmt, and add a cross-platform code requirement.

* fix: resolve clippy warnings breaking CI on ubuntu and windows

Use clone() instead of implicit to_string() on already-owned String
values, gate the windows-only unused make_file_at import behind
cfg(posix), and fix unused mut / manual assign-op in the windows-only
localhost test.

* fix: fmt

README.md

@@ -43,7 +43,7 @@ Termscp is a feature rich terminal file transfer and explorer, with support for
 
 ## Features 🎁
 
-- 📁  Different communication protocols
+- 📁 Different communication protocols
   - **SFTP**
   - **SCP**
   - **FTP** and **FTPS**
@@ -51,31 +51,31 @@ Termscp is a feature rich terminal file transfer and explorer, with support for
   - **S3**
   - **SMB**
   - **WebDAV**
-- 🖥  Explore and operate on the remote and on the local machine file system with a handy UI
+- 🖥 Explore and operate on the remote and on the local machine file system with a handy UI
   - Create, remove, rename, search, view and edit files
-- ⭐  Connect to your favourite hosts through built-in bookmarks and recent connections
-- 📝  View and edit files with your favourite applications
-- 💁  SFTP/SCP authentication with SSH keys and username/password
-- 🐧  Compatible with Windows, Linux, FreeBSD, NetBSD and MacOS
-- 🐚  Embedded terminal for executing commands on the system.
-- 🎨  Make it yours!
+- ⭐ Connect to your favourite hosts through built-in bookmarks and recent connections
+- 📝 View and edit files with your favourite applications
+- 💁 SFTP/SCP authentication with SSH keys and username/password
+- 🐧 Compatible with Windows, Linux, FreeBSD, NetBSD and MacOS
+- 🐚 Embedded terminal for executing commands on the system.
+- 🎨 Make it yours!
   - Themes
   - Custom file explorer format
   - Customizable text editor
   - Customizable file sorting
   - and many other parameters...
-- 📫  Get notified via Desktop Notifications when a large file has been transferred
-- 🔭  Keep file changes synchronized with the remote host
-- 🔐  Save your password in your operating system key vault
-- 🦀  Rust-powered
-- 👀  Developed keeping an eye on performance
-- 🦄  Frequent awesome updates
+- 📫 Get notified via Desktop Notifications when a large file has been transferred
+- 🔭 Keep file changes synchronized with the remote host
+- 🔐 Save your password in your operating system key vault
+- 🦀 Rust-powered
+- 👀 Developed keeping an eye on performance
+- 🦄 Frequent awesome updates
 
 ---
 
 ## Get started 🚀
 
-If you're considering to install termscp I want to thank you 💜 ! I hope you will enjoy termscp!  
+If you're considering to install termscp I want to thank you 💜 ! I hope you will enjoy termscp!\
 If you want to contribute to this project, don't forget to check out our [contribute guide](CONTRIBUTING.md).
 
 If you are a Linux, a FreeBSD or a MacOS user this simple shell script will install termscp on your system with a single command:
@@ -131,10 +131,10 @@ These requirements are not forced required to run termscp, but to enjoy all of i
 
 - **Linux/FreeBSD** users:
   - To **open** files via `V` (at least one of these)
-    - *xdg-open*
-    - *gio*
-    - *gnome-open*
-    - *kde-open*
+    - _xdg-open_
+    - _gio_
+    - _gnome-open_
+    - _kde-open_
 - **Linux** users:
   - A keyring manager: read more in the [User manual](https://docs.termscp.rs/en-US/configuration/password-security.html#linux-keyring)
 - **WSL** users