fix: correct default hook DLL path

The default hook_dll_path was constructed relative to Documents/OpenFUT/
but the launcher repo lives at Documents/openfut-launcher/, causing the
Setup tab to always show "DLL not built yet" even after building.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/config.rs

@@ -47,8 +47,9 @@ impl Default for LauncherConfig {
                 .into(),
             bridge_core_url: "http://127.0.0.1:8080".into(),
             bridge_tls_enabled: true,
-            hook_dll_path: base
-                .join("openfut-launcher/openfut-hook/target/x86_64-pc-windows-gnu/release/openfut_hook.dll")
+            hook_dll_path: dirs::home_dir()
+                .map(|h| h.join("Documents/openfut-launcher/openfut-hook/target/x86_64-pc-windows-gnu/release/openfut_hook.dll"))
+                .unwrap_or_default()
                 .to_string_lossy()
                 .into(),
             fifa_game_dir: dirs::home_dir()