report: grow the Prompter port and move display_path out of the ui module

Prompter gains interactive(), select() and text() (with the Validator
type), and confirm() now propagates cancellation as Err so flows abort
instead of silently taking a default when the user hits Ctrl+C. The
terminal prompter implements the full port; the port also re-exports
the path display helper, which is pure presentation formatting used by
events and messages rather than terminal code.

src/ui.rs

@@ -10,27 +10,8 @@ pub mod prompt;
 #[cfg(test)]
 use indicatif::ProgressDrawTarget;
 use indicatif::{MultiProgress, ProgressBar, ProgressStyle};
-use std::path::Path;
 use std::time::Duration;
 
-/// Render a path for terminal display: relative to the current working
-/// directory when the target lives inside it or directly next to it
-/// (`../name`, the usual layout of build artifacts), absolute otherwise.
-pub fn display_path(path: &Path) -> String {
-    let Ok(cwd) = std::env::current_dir() else {
-        return path.display().to_string();
-    };
-    if let Ok(rel) = path.strip_prefix(&cwd) {
-        return rel.display().to_string();
-    }
-    if let Some(parent) = cwd.parent()
-        && let Ok(rel) = path.strip_prefix(parent)
-    {
-        return format!("../{}", rel.display());
-    }
-    path.display().to_string()
-}
-
 /// Style of an unsized operation: spinner and prefix on one line
 pub(crate) fn spinner_style() -> ProgressStyle {
     ProgressStyle::default_bar()