refactor(ui): 清理 K26 旧 UI 与死代码

lib/l10n/app_en.arb

@@ -142,8 +142,6 @@
   "reportFailed": "Could not submit report.",
   "shareFailed": "Could not open the share sheet.",
   "nowPlaying": "Playing now",
-  "watchFullscreen": "Watch in landscape",
-  "exitFullscreen": "Exit fullscreen",
   "pictureInPicture": "Picture in picture",
   "pipUnavailable": "Picture in picture is unavailable on this device",
   "originalTag": "Original",
@@ -272,8 +270,6 @@
   "myListTab": "My List",
   "watchFull": "Watch Full",
   "swipeForNext": "Swipe up for next",
-  "clearScreen": "Clear screen",
-  "exitClearScreen": "Exit clear screen",
   "logIn": "Log in",
   "logInHint": "Keep your coins and list",
   "rewards": "Rewards",