feat: add keyboard shortcut help modal triggered by ? key

src/hooks/useKeyboardShortcuts.ts

@@ -41,6 +41,12 @@ export function useKeyboardShortcuts(): void {
         document.dispatchEvent(new CustomEvent("close-all-modals"));
         return;
       }
+
+      if (e.key === "?" || (e.shiftKey && e.key === "/")) {
+        e.preventDefault();
+        document.dispatchEvent(new CustomEvent("open-shortcut-help"));
+        return;
+      }
     }
 
     document.addEventListener("keydown", handleKeyDown);