fix: demo video

[tabathad]

The demo video on the homepage was not playing. Users would click
"Watch the demo" and see a black screen with video controls but no
playback.

ReactPlayer's pip={true} prop attempted to enable
Picture-in-Picture before video metadata loaded, causing an error that
prevented playback. This may be related to recent React 19 update, as
the video previously worked with the same ReactPlayer configuration.

Replaced ReactPlayer with native HTML5 <video> element.
The video now plays correctly with all expected functionality:

• Starts at 8:16 timestamp (using Media Fragments #t=496)
• Shows browser native controls
• Works on desktop and mobile
• Maintains 16:9 aspect ratio in terminal window display

Removed react-player import as it's no longer needed for simple MP4 playback.

fixes #1191

[netlify]

✅ Deploy Preview for endearing-brigadeiros-63f9d0 ready!

Name	Link
🔨 Latest commit	c461e1d
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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 83.35%. Comparing base (9f24d3f) to head (c461e1d).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1298   +/-   ##
=======================================
  Coverage   83.35%   83.35%           
=======================================
  Files          70       70           
  Lines        3004     3004           
  Branches      499      499           
=======================================
  Hits         2504     2504           
  Misses        397      397           
  Partials      103      103           

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[kriswest]

@06kellyjac of @grovesy @coopernetes could one of you approve this, I can't see the preview currently (getting FINOS to fix preview generation so that I can in future).