v1.1.1

1.1.1 adjusts spacing between adjacent card-rendered semantic panels, splits light mode palette variables from the core to match the dark variables, updates the kitchen sink test page.

• Added explicit spacing between adjacent card-rendered semantic panels, fixing
  sections/cards running together in the docs.
• Split theme palette CSS into separate cascade layers:
  • vitre.theme for shared variables
  • vitre.light for light palette values
  • vitre.dark for dark/system-dark palette values
• Improved kitchen sink embedded media:
  • added local MP3 example
  • added local MP4 video example
  • added YouTube iframe example
  • added object/embed examples with captions
• Added block-size: auto to reset media sizing so images/video/canvas/svg scale more
  predictably.
• Renamed media assets to shorter names:
  • september.mp3
  • drowning-in-life-clip.mp4
• Updated docs sync script to copy kitchen sink media into docs/media.
• Fixed kitchen sink Docs nav link to use index.html, so it works in file: mode.
• Updated changelog and synced docs/vitre.css / docs/test.html.