fix: resolve clippy linting warnings in user_output module

- Added backticks around UserOutput in doc comment
- Replaced wildcard imports with explicit imports in core.rs
- Replaced wildcard imports with explicit imports in test_support.rs
- Added #[must_use] attribute to endpoint() method in telemetry.rs

All clippy pedantic checks now pass.

Co-authored-by: josecelano <[email protected]>

Author: Copilot

src/presentation/user_output/core.rs

@@ -1,8 +1,11 @@
-//! Core UserOutput struct and implementation
+//! Core `UserOutput` struct and implementation
 
 use std::io::Write;
 
-use super::messages::*;
+use super::messages::{
+    ErrorMessage, InfoBlockMessage, ProgressMessage, ResultMessage, StepsMessage, SuccessMessage,
+    WarningMessage,
+};
 use super::sinks::StandardSink;
 use super::verbosity::VerbosityFilter;
 use super::{Channel, FormatterOverride, OutputMessage, OutputSink, Theme, VerbosityLevel};

src/presentation/user_output/sinks/telemetry.rs

@@ -23,6 +23,7 @@ impl TelemetrySink {
 
     /// Get the endpoint URL
     #[cfg(test)]
+    #[must_use]
     pub fn endpoint(&self) -> &str {
         &self.endpoint
     }

src/presentation/user_output/test_support.rs

@@ -6,7 +6,7 @@
 use std::io::Write;
 use std::sync::{Arc, Mutex};
 
-use super::*;
+use super::{Theme, UserOutput, VerbosityLevel};
 
 /// Writer implementation for tests that writes to a shared buffer
 ///