Ignore hotkeys with modifiers

Avoids unintentionally triggering when using system shortcuts like
`command+[` in macOS

app/javascript/controllers/card_hotkeys_controller.js

@@ -10,7 +10,7 @@ export default class extends Controller {
   }
 
   handleKeydown(event) {
-    if (this.#shouldIgnore(event)) return
+    if (this.#shouldIgnore(event) || this.#hasModifier(event)) return
 
     const handler = this.#keyHandlers[event.key.toLowerCase()]
     if (handler) {
@@ -37,6 +37,10 @@ export default class extends Controller {
            target.closest("input, textarea, [contenteditable], lexxy-editor")
   }
 
+  #hasModifier(event) {
+    return event.metaKey || event.ctrlKey || event.altKey || event.shiftKey
+  }
+
   get #selectedCard() {
     // Find the navigable-list that currently has focus
     const focusedList = this.navigableListOutlets.find(list => list.hasFocus)