Koala73/worldmonitor New commit

feat: redesign settings World Monitor tab + sidecar RSS proxy + v2.5.3
Rebuild the World Monitor settings tab with hero banner, license key
input, waitlist registration, and BYOK footer. Only validate API key
panels that have pending changes on save. Add local RSS proxy handler
to sidecar so desktop fetches feeds directly without cloud fallback.
Bump version to 2.5.3.