[demolaf]

Reverts the three commits merged after the 10.0.0 tag so master matches the 10.0.0 release again. They move to version-10.0.1 and come back through a PR from that branch.

Changes

• Reverts chore(deps): combine dependabot updates 20261103 #2547 (Facebook SDK 18.3.0 to 19.0.0), sample(auth): add Grid, Coffee Spark and Professional themes with dark mode to the full customization demo #2545 (full customization demo themes) and docs: correct the auth README and getting-started guide against the GA API surface #2544 (README and getting-started corrections, AuthException message typo fixes, version string bump).
• The resulting tree is identical to the 10.0.0 tag (478106d).

[gemini-code-assist]

Code Review

This pull request removes the 'Professional' theme customization and simplifies the custom theme implementation in the FirebaseUI Auth demo app, while updating dependencies to version 10.0.0-beta05 and revising the documentation to reflect the beta release. Feedback on the changes highlights several issues: a potential silent failure when updating passwords if the current user is null, typos introduced in exception messages, and multiple instances of hardcoded Color.White that break dark mode support in text fields and surfaces.

[russellwheatley]

LGTM