Previously the tap-to-load placeholder only kicked in when the proxy was
also disabled. The proxy still saves bandwidth, but users who flipped on
low-bandwidth mode generally want the explicit consent step on every
image — proxied or not. Make the two settings independent:
- ImageGallery / ProxiedImage: gate on lowBandwidthMode alone.
- LinkPreview: suppress thumbnail whenever lowBandwidthMode is on.
- Settings copy + AppConfig JSDoc updated to match.
Chad Curtis
6f9257621a