feat: reject new chords that override another chord

src/i18n/de/index.ts

@@ -108,6 +108,7 @@ const de = {
       TITLE: "Akkorde",
       HOLD_KEYS: "Akkord halten",
       NEW_CHORD: "Neuer Akkord",
+      DUPLICATE: "Akkord existiert bereits",
       search: {
         PLACEHOLDER: "{0} Akkord{{|e}} durchsuchen",
       },

src/i18n/en/index.ts

@@ -104,6 +104,7 @@ const en = {
       TITLE: "Chords",
       HOLD_KEYS: "Hold chord",
       NEW_CHORD: "New chord",
+      DUPLICATE: "Chord already exists",
       search: {
         PLACEHOLDER: "Search {0} chord{{|s}}",
       },

src/routes/config/chords/+page.svelte

@@ -55,6 +55,11 @@
   }
 
   function insertChord(actions: number[]) {
+    const id = JSON.stringify(actions)
+    if ($chords.some(it => JSON.stringify(it.actions) === id)) {
+      alert($LL.configure.chords.DUPLICATE())
+      return
+    }
     changes.update(changes => {
       changes.push({
         type: ChangeType.Chord,