36ecd2cf30
Problem: pressing T in audience window only swapped the host page's
theme CSS link. Preview iframes in the presenter window stayed on the
theme that was active when the popup was opened (or the HTML default).
Fix: 3-hop theme propagation via message types
1. audience cycleTheme() → BroadcastChannel 'theme' message
2. presenter window receives BC msg → postMessage 'preview-theme'
to both iframes
3. iframe preview mode listens for 'preview-theme' → swaps its own
<link id='theme-link'> href
Also:
- Audience window listens for 'theme' BC events → applies theme
(so pressing T in one window cycles theme in BOTH)
- Presenter window captures audience's current theme at open time
(data-theme attr) and forwards it to each iframe on 'preview-ready'
so previews match audience from frame 1, even if audience had
already cycled theme before opening presenter
- preview mode auto-detects theme base path from existing
theme-link href (same logic as audience cycleTheme)
Verified in headless Chrome: BC msg {type:theme, name:dracula} →
both audience and preview iframes show data-theme=dracula with
matching colors.
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|---|---|---|
| .. | ||
| animations | ||
| themes | ||
| base.css | ||
| fonts.css | ||
| runtime.js | ||