Fix second audit findings and restore crash detection dialog

src/main.rs

@@ -14,8 +14,9 @@ use application::DriftwoodApplication;
 use config::{APP_ID, GSETTINGS_SCHEMA_DIR};
 
 fn main() -> ExitCode {
-    // Point GSettings at our compiled schema directory (dev builds)
-    std::env::set_var("GSETTINGS_SCHEMA_DIR", GSETTINGS_SCHEMA_DIR);
+    // Point GSettings at our compiled schema directory (dev builds).
+    // SAFETY: Called before any threads are spawned, at program start.
+    unsafe { std::env::set_var("GSETTINGS_SCHEMA_DIR", GSETTINGS_SCHEMA_DIR); }
 
     // Parse CLI arguments
     let parsed = cli::Cli::parse();