The 200px left margin was a workaround when the footer was at outer
Row=2 with no column constraint and had to dodge the sidebar visually.
Now that Row=2 + Col=1 cleanly cantons the footer in the content
column (commit ab40b62), the margin pushes everything 200px further
right and creates a black gap at the bottom-left of the content area.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>