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/components/WindowControls.tsx

@@ -0,0 +1,38 @@
+import { getCurrentWindow } from '@tauri-apps/api/window';
+import { Minus, Square, X } from 'lucide-react';
+
+const appWindow = getCurrentWindow();
+
+export function WindowControls() {
+  return (
+    <div className="window-controls" aria-label="Window controls">
+      <button
+        type="button"
+        className="window-control"
+        title="Minimize"
+        aria-label="Minimize"
+        onClick={() => void appWindow.minimize()}
+      >
+        <Minus size={13} strokeWidth={2.25} />
+      </button>
+      <button
+        type="button"
+        className="window-control"
+        title="Maximize"
+        aria-label="Maximize"
+        onClick={() => void appWindow.toggleMaximize()}
+      >
+        <Square size={11} strokeWidth={2.25} />
+      </button>
+      <button
+        type="button"
+        className="window-control close"
+        title="Close"
+        aria-label="Close"
+        onClick={() => void appWindow.close()}
+      >
+        <X size={14} strokeWidth={2.25} />
+      </button>
+    </div>
+  );
+}