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

src/ui/activities/filetransfer/lib/pane.rs

@@ -28,8 +28,6 @@ impl Pane {
 
 #[cfg(test)]
 mod tests {
-    use std::path::PathBuf;
-
     use super::*;
     use crate::explorer::builder::FileExplorerBuilder;
     use crate::host::Localhost;
@@ -52,6 +50,6 @@ mod tests {
     fn test_pane_pwd() {
         let mut pane = make_pane();
         let pwd = pane.fs.pwd().unwrap();
-        assert_eq!(pwd, PathBuf::from(std::env::temp_dir()));
+        assert_eq!(pwd, std::env::temp_dir());
     }
 }

src/ui/activities/filetransfer/session/transfer.rs

@@ -211,7 +211,8 @@ impl FileTransferActivity {
     /// Shared scan walk. `remote_side` selects which pane lists directories
     /// (remote for downloads, local for uploads).
     ///
-    /// The walk is abortable via [`crate::ui::activities::filetransfer::lib::TransferStates::aborted`]
+    /// The walk is abortable via
+    /// [`TransferStates::aborted`](crate::ui::activities::filetransfer::lib::transfer::TransferStates::aborted)
     /// and periodically redraws a "Scanning…" popup to keep the UI responsive.
     fn scan_worklist(
         &mut self,

src/ui/activities/setup/actions.rs

@@ -15,8 +15,8 @@ use super::{Id, IdSsh, IdTheme, SetupActivity, ViewLayout};
 use crate::config::themes::Theme;
 
 impl SetupActivity {
-    /// On <ESC>, if there are changes in the configuration, the quit dialog must be shown, otherwise
-    /// we can exit  without any problem
+    /// On `ESC`, if there are changes in the configuration, the quit dialog
+    /// must be shown; otherwise, we can exit without any problem.
     pub(super) fn action_on_esc(&mut self) {
         if self.config_changed() {
             self.mount_quit();