Keep Cloud as the OIDC/WebID authority for Local+Cloud flows while constraining Pod creation and WebID selection to the selected Local SP. Also preserve ChatKit thread lists after create.

Tested: bun run build:ts
Tested: bun run build:components
Tested: bun run check:platform-package-version
Tested: bun run test:integration:lite
Tested: bun run test:integration:full