fix: resolve compilation issues in PermissionDenied test

- Replace non-existent uv_command! macro with context.pip_compile() pattern
- Add Unix PermissionsExt import for std::fs::Permissions::from_mode usage
- Fix test compilation errors that caused clippy and test failures

Author: ahundt

crates/uv/tests/it/show_settings.rs

@@ -1,6 +1,9 @@
 use std::path::Path;
 use std::process::Command;
 
+#[cfg(unix)]
+use std::os::unix::fs::PermissionsExt;
+
 use assert_fs::prelude::*;
 use uv_static::EnvVars;
 
@@ -10690,7 +10693,7 @@ fn resolve_permission_denied() -> anyhow::Result<()> {
     requirements_in.write_str("anyio>3.0.0")?;
 
     // Test 1: Normal permissions - should find and use parent config.
-    let result = uv_command!(context.pip_compile(), context.temp_dir.path())
+    let result = context.pip_compile()
         .arg("--show-settings")
         .arg("requirements.in")
         .current_dir(&child)
@@ -10705,7 +10708,7 @@ fn resolve_permission_denied() -> anyhow::Result<()> {
     // Remove read permissions from the parent directory.
     fs_err::set_permissions(parent.path(), std::fs::Permissions::from_mode(0o000))?;
 
-    let result = uv_command!(context.pip_compile(), context.temp_dir.path())
+    let result = context.pip_compile()
         .arg("--show-settings")
         .arg("requirements.in")
         .current_dir(&child)
@@ -10727,7 +10730,7 @@ fn resolve_permission_denied() -> anyhow::Result<()> {
     assert!(stderr.contains("continuing search"));
 
     // Test 3: UV_NO_CONFIG - should skip all config discovery silently.
-    let result = uv_command!(context.pip_compile(), context.temp_dir.path())
+    let result = context.pip_compile()
         .arg("--show-settings")
         .arg("requirements.in")
         .arg("--no-config")