feat: add copy icon for user messages (#449)

* feat: add copy icon for user messages

Expose a copy control on user chat bubbles so previous content can be reused quickly.

* fix: Copy control is effectively hidden on touch devices

* fix: copyTextToClipboard doesn't need timer

---------

Co-authored-by: dev <dev@host.local>
Co-authored-by: Haileyesus <118998054+blackmammoth@users.noreply.github.com>

src/i18n/locales/en/chat.json

@@ -4,6 +4,10 @@
     "copied": "Copied",
     "copyCode": "Copy code"
   },
+  "copyMessage": {
+    "copy": "Copy message",
+    "copied": "Message copied"
+  },
   "messageTypes": {
     "user": "U",
     "error": "Error",

src/i18n/locales/ja/chat.json

@@ -4,6 +4,10 @@
     "copied": "コピーしました",
     "copyCode": "コードをコピー"
   },
+  "copyMessage": {
+    "copy": "メッセージをコピー",
+    "copied": "メッセージをコピーしました"
+  },
   "messageTypes": {
     "user": "U",
     "error": "エラー",

src/i18n/locales/ko/chat.json

@@ -4,6 +4,10 @@
     "copied": "복사됨",
     "copyCode": "코드 복사"
   },
+  "copyMessage": {
+    "copy": "메시지 복사",
+    "copied": "메시지 복사됨"
+  },
   "messageTypes": {
     "user": "U",
     "error": "오류",

src/i18n/locales/zh-CN/chat.json

@@ -4,6 +4,10 @@
     "copied": "已复制",
     "copyCode": "复制代码"
   },
+  "copyMessage": {
+    "copy": "复制消息",
+    "copied": "消息已复制"
+  },
   "messageTypes": {
     "user": "U",
     "error": "错误",