fix: restore cmd/ctrl+a select-all in reader popup textarea

Author: Chapoly1305

src/modules/popup.ts

@@ -139,6 +139,7 @@ export function buildReaderPopup(
 
   const makeId = (type: string) =>
     `${config.addonRef}-${reader._instanceID}-${type}`;
+  const onTextAreaCopy = getOnTextAreaCopy(popup, makeId("text"));
 
   const hidePopupTextarea = getPref("enableHidePopupTextarea") as boolean;
   append(
@@ -244,6 +245,10 @@ export function buildReaderPopup(
                 );
               },
             },
+            {
+              type: "keydown",
+              listener: onTextAreaCopy as (ev: Event) => void,
+            },
             {
               type: "dblclick",
               listener: (_ev) => {