fix(windows): hide engine consoles

Disable the native Windows frame at startup and render in-app window controls so packaged builds use Firelink's own titlebar placement instead of the default OS chrome.

Apply CREATE_NO_WINDOW to raw child processes used by the aria2 daemon and shared engine version checks. Route ffmpeg and deno checks through the same hidden version-check helper so Settings > Engine does not flash console windows.

Normalize Windows extended-length paths before returning approved download roots to the UI, while keeping canonicalization for backend safety checks. Detect yt-dlp's embedded runtime per platform so Windows onedir builds look for python*.dll instead of macOS Python.framework.

Verification: npm run build; cargo check --manifest-path src-tauri/Cargo.toml; cargo test --manifest-path src-tauri/Cargo.toml --lib; node --check scripts/smoke-packaged-app.js; Ruby YAML parse for .github/workflows/release.yml; git diff --check.

src-tauri/src/platform.rs

@@ -39,6 +39,50 @@ pub fn engine_binary_name(engine: &str) -> String {
     format!("{engine}-{}{}", target_triple(), executable_suffix())
 }
 
+#[cfg(target_os = "windows")]
+const CREATE_NO_WINDOW: u32 = 0x08000000;
+
+pub fn hide_child_console(command: &mut std::process::Command) {
+    #[cfg(target_os = "windows")]
+    {
+        use std::os::windows::process::CommandExt;
+        command.creation_flags(CREATE_NO_WINDOW);
+    }
+
+    #[cfg(not(target_os = "windows"))]
+    {
+        let _ = command;
+    }
+}
+
+pub fn hide_tokio_child_console(command: &mut tokio::process::Command) {
+    #[cfg(target_os = "windows")]
+    {
+        command.creation_flags(CREATE_NO_WINDOW);
+    }
+
+    #[cfg(not(target_os = "windows"))]
+    {
+        let _ = command;
+    }
+}
+
+pub fn display_path(path: &Path) -> String {
+    let text = path.to_string_lossy();
+
+    #[cfg(target_os = "windows")]
+    {
+        if let Some(stripped) = text.strip_prefix(r"\\?\UNC\") {
+            return format!(r"\\{stripped}");
+        }
+        if let Some(stripped) = text.strip_prefix(r"\\?\") {
+            return stripped.to_string();
+        }
+    }
+
+    text.to_string()
+}
+
 pub fn trusted_system_path() -> Result<OsString, String> {
     let entries = trusted_system_path_entries();
     std::env::join_paths(entries)