Fix second audit findings and restore crash detection dialog

src/core/sandbox.rs

@@ -44,8 +44,7 @@ impl ProfileSource {
 
 /// Directory where local sandbox profiles are stored.
 fn profiles_dir() -> PathBuf {
-    let dir = dirs::config_dir()
-        .unwrap_or_else(|| PathBuf::from("~/.config"))
+    let dir = crate::config::config_dir_fallback()
         .join("driftwood")
         .join("sandbox");
     fs::create_dir_all(&dir).ok();