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/build/mod.rs

@@ -170,10 +170,13 @@ fn retry_after_revendor(
     original: Box<dyn Error>,
 ) -> Result<SourceBuildOutput, Box<dyn Error>> {
     log::error!("{original}");
-    if !prompter.confirm(
-        "Re-vendor the Cargo dependencies and retry the build?",
-        false,
-    ) {
+    if !prompter
+        .confirm(
+            "Re-vendor the Cargo dependencies and retry the build?",
+            false,
+        )
+        .unwrap_or(false)
+    {
         view.finish_failure();
         return Err(original);
     }