Swap the 📚 emoji in the header for an inline SVG mark - a rounded
square with a play triangle, echoing that this is a video-course
library. Uses var(--accent)/var(--bg-secondary) rather than fixed
colors so it re-colors automatically with whichever of the app's
theme presets is active, same as everything else in the header.
Applied consistently across all 5 templates; the small secondary
footer brand mark (still plain 📚 text) is untouched - this only
replaces the prominent header lockup.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
rmsitzandClaude Sonnet 5
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