refactor: clean up code and improve compatibility

- Added conditional compilation for Unix environments in the SSH agent module.
- Removed an unused warning comment in the ironrdp-connector.
- Simplified import statements in the picky signature module.
- Streamlined the build script for zmodem2 by removing unnecessary warning messages.

src-tauri/src/core/ssh/agent.rs

@@ -10,6 +10,7 @@ use crate::error::{AppError, AppResult};
 use russh::keys::agent::client::{AgentClient, AgentStream};
 #[cfg(windows)]
 use std::ffi::OsStr;
+#[cfg(unix)]
 use std::path::Path;
 use std::time::Duration;
 
@@ -171,6 +172,7 @@ async fn connect_pageant() -> AppResult<DynamicAgentStream> {
     Ok(client.into_inner())
 }
 
+#[cfg(any(unix, test))]
 fn normalize_environment_variable(value: &str) -> AppResult<&str> {
     let variable = value.trim().trim_start_matches('$').trim();
     if variable.is_empty() {

src-tauri/vendor/ironrdp-connector/src/connection.rs

@@ -772,7 +772,6 @@ fn respond_to_connect_time_autodetect(
     }
 }
 
-#[expect(single_use_lifetimes)] // anonymous lifetimes in `impl Trait` are unstable
 fn create_gcc_blocks<'a>(
     config: &Config,
     selected_protocol: nego::SecurityProtocol,

src-tauri/vendor/picky/src/signature.rs

@@ -5,7 +5,7 @@ use crate::key::ec::{EcComponent, EcCurve, NamedEcCurve};
 use crate::key::{KeyError, PrivateKey, PublicKey};
 
 use picky_asn1_x509::{AlgorithmIdentifier, oids};
-use rsa::signature::{SignatureEncoding as _, Signer};
+use rsa::signature::Signer;
 use serde::{Deserialize, Serialize};
 use thiserror::Error;
 

src-tauri/vendor/zmodem2/build.rs

@@ -17,9 +17,7 @@ fn main() {
             println!("cargo:rustc-env=ZMODEM_RZ_BIN={}", rz_path.display());
             println!("cargo:rustc-env=ZMODEM_SZ_BIN={}", sz_path.display());
         }
-        _ => {
-            println!("cargo:warning=lrzsz not found");
-        }
+        _ => {}
     }
 }