video player: fill the frame in fullscreen

the video used max-w/max-h so a low-res source stayed at native size surrounded
by black. switch to w-full h-full object-contain so it scales up to fill the
player (windowed and fullscreen) while preserving aspect ratio.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/workspaces/officerdev/src/apps/FileViewer/renderers/VideoRenderer.tsx

@@ -227,7 +227,7 @@ export const VideoRenderer = ({ src, fileName, filePath, root }: VideoRendererPr
         if (playing) setShowControls(false);
       }}
     >
-      <video ref={videoRef} src={videoSrc} preload="metadata" playsInline className="max-w-full max-h-full" onClick={togglePlay}>
+      <video ref={videoRef} src={videoSrc} preload="metadata" playsInline className="w-full h-full object-contain" onClick={togglePlay}>
         {subtitles.map((t) => (
           <track key={t.id} kind="subtitles" src={getSubtitleVttUrl(filePath, t.id, root)} srcLang={t.lang} label={t.label} />
         ))}