fix(butler): runtime fixes — SQLite mode=rwc + React hooks ordering

- Add ?mode=rwc to pain.db SQLite URL so it creates the file on first run
- Move useUIModeStore hook before conditional returns in App.tsx to fix
  React "Rendered more hooks than during the previous render" error

desktop/src-tauri/src/lib.rs

@@ -165,7 +165,7 @@ pub fn run() {
                 std::fs::create_dir_all(&pain_db_dir).expect("Failed to create intelligence dir");
 
                 let db_path = pain_db_dir.join("pain.db");
-                let db_url = format!("sqlite:{}", db_path.display());
+                let db_url = format!("sqlite:{}?mode=rwc", db_path.display());
                 let pool = rt.block_on(sqlx::SqlitePool::connect(&db_url))
                     .expect("Failed to connect pain storage SQLite pool");