🛡️ Sentinel: [HIGH] Fix command injection in Process executions

Sources/Cacheout/Models/CacheCategory.swift

@@ -186,8 +186,23 @@ struct CacheCategory: Identifiable, Hashable {
     }
 
     private func toolExists(_ tool: String) -> Bool {
-        let result = shell("/usr/bin/which \(tool)")
-        return result != nil && !result!.isEmpty
+        let process = Process()
+        process.executableURL = URL(fileURLWithPath: "/usr/bin/which")
+        process.arguments = [tool]
+        process.standardOutput = FileHandle.nullDevice
+        process.standardError = FileHandle.nullDevice
+        process.environment = [
+            "PATH": "/opt/homebrew/bin:/usr/local/bin:/usr/bin:/bin:/usr/sbin",
+            "HOME": FileManager.default.homeDirectoryForCurrentUser.path
+        ]
+
+        do {
+            try process.run()
+            process.waitUntilExit()
+            return process.terminationStatus == 0
+        } catch {
+            return false
+        }
     }
 
     private func runProbe(_ command: String) -> String? {

Sources/Cacheout/ViewModels/CacheoutViewModel.swift

@@ -231,8 +231,8 @@ class CacheoutViewModel: ObservableObject {
 
         let process = Process()
         let pipe = Pipe()
-        process.executableURL = URL(fileURLWithPath: "/bin/bash")
-        process.arguments = ["-c", "docker system prune -f 2>&1"]
+        process.executableURL = URL(fileURLWithPath: "/usr/bin/env")
+        process.arguments = ["docker", "system", "prune", "-f"]
         process.standardOutput = pipe
         process.standardError = pipe
         process.environment = [