Chromium already supports dynamic edge-to-edge viewports. This change
opts-in by default, making the gesture navigation bar (chin) invisible
without needing scroll interaction.
No other changes were necessary, as no content relied on specific
viewport insets.
Command used:
```
sed -i 's/<meta name="viewport" content="width=device-width, initial-scale=1"\/>/<meta name="viewport" content="width=device-width, initial-scale=1, viewport-fit=cover"\/>/g' **/*.html
```
