feat: add unit tests (Rust parser+DB, Vitest frontend) and test workflow

src/components/GuideView.tsx

@@ -14,7 +14,7 @@ function useWindowWidth() {
   return width;
 }
 
-function combatIcon(name: string): string {
+export function combatIcon(name: string): string {
   const l = name.toLowerCase();
   if (l === "solo") return "🗡️";
   if (l === "groupe") return "⚔️";