Use display representation for download error (#5173)

## Summary

Turns out we already have display for this.

Closes https://github.com/astral-sh/uv/issues/4914.

Cargo.lock

@@ -4934,6 +4934,7 @@ dependencies = [
  "install-wheel-rs",
  "itertools 0.13.0",
  "once_cell",
+ "owo-colors",
  "pep440_rs",
  "pep508_rs",
  "platform-tags",

crates/uv-python/Cargo.toml

@@ -34,6 +34,7 @@ fs-err = { workspace = true, features = ["tokio"] }
 futures = { workspace = true }
 itertools = { workspace = true }
 once_cell = { workspace = true }
+owo-colors = { workspace = true }
 regex = { workspace = true }
 reqwest = { workspace = true }
 reqwest-middleware = { workspace = true }

crates/uv-python/src/downloads.rs

@@ -6,6 +6,7 @@ use std::str::FromStr;
 use std::task::{Context, Poll};
 
 use futures::TryStreamExt;
+use owo_colors::OwoColorize;
 use thiserror::Error;
 use tokio::io::{AsyncRead, ReadBuf};
 use tokio_util::compat::FuturesAsyncReadCompatExt;
@@ -30,9 +31,9 @@ pub enum Error {
     IO(#[from] io::Error),
     #[error(transparent)]
     ImplementationError(#[from] ImplementationError),
-    #[error("Invalid python version: {0}")]
+    #[error("Invalid Python version: {0}")]
     InvalidPythonVersion(String),
-    #[error("Invalid request key, too many parts: {0}")]
+    #[error("Invalid request key (too many parts): {0}")]
     TooManyParts(String),
     #[error("Download failed")]
     NetworkError(#[from] WrappedReqwestError),
@@ -48,7 +49,7 @@ pub enum Error {
         expected: String,
         actual: String,
     },
-    #[error("Invalid download url")]
+    #[error("Invalid download URL")]
     InvalidUrl(#[from] url::ParseError),
     #[error("Failed to create download directory")]
     DownloadDirError(#[source] io::Error),
@@ -64,12 +65,9 @@ pub enum Error {
         #[source]
         err: io::Error,
     },
-    #[error("Failed to parse managed Python directory name: {0}")]
-    NameError(String),
     #[error("Failed to parse request part")]
     InvalidRequestPlatform(#[from] platform::Error),
-    // TODO(zanieb): Implement display for `PythonDownloadRequest`
+    #[error("No download found for request: {}", _0.green())]
-    #[error("No download found for request: {0:?}")]
     NoDownloadFound(PythonDownloadRequest),
 }
 

crates/uv/src/commands/python/install.rs

@@ -91,7 +91,7 @@ pub(crate) async fn install(
             .find(|installation| download_request.satisfied_by_key(installation.key()))
         {
             if matches!(request, PythonRequest::Any) {
-                writeln!(printer.stderr(), "Found: {}", installation.key().green(),)?;
+                writeln!(printer.stderr(), "Found: {}", installation.key().green())?;
             } else {
                 writeln!(
                     printer.stderr(),