feat(video): add video format family, resolution control, and marquee pair

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

frontend/src/locales/en.json

@@ -23,7 +23,9 @@
     "compression": "Compression",
     "iconSize": "Icon size",
     "compressPdf": "Compress as JPEG",
-    "bitrate": "Bitrate"
+    "bitrate": "Bitrate",
+    "resolution": "Resolution",
+    "original": "Original"
   },
   "job": {
     "converting": "Converting...",
@@ -43,7 +45,8 @@
     "fonts": "Fonts",
     "ebooks": "Ebooks",
     "archives": "Archives",
-    "audio": "Audio"
+    "audio": "Audio",
+    "video": "Video"
   },
   "footer": {
     "rights": "Ombrora Convert — Online file conversion"