Persist last applied theme in session storage to prevent light-mode flash and toggle flicker when navigating (notably player.html).
Revert README preview to img/preview.png (GIF had rendering artifacts).
Test plan
Navigate movies.html -> player.html with dark mode enabled (no flash).
Toggle theme on player.html, then navigate back and forth (theme stays consistent).
## Summary
- Persist last applied theme in session storage to prevent light-mode flash and toggle flicker when navigating (notably `player.html`).
- Revert README preview to `img/preview.png` (GIF had rendering artifacts).
## Test plan
- Navigate `movies.html` -> `player.html` with dark mode enabled (no flash).
- Toggle theme on `player.html`, then navigate back and forth (theme stays consistent).
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Summary
player.html).img/preview.png(GIF had rendering artifacts).Test plan
movies.html->player.htmlwith dark mode enabled (no flash).player.html, then navigate back and forth (theme stays consistent).