* [Android] Show loading state in Origin preferences during post-purchase credential fetch
When a Brave Origin purchase is completed, there is a delay while the
receipt is passed from Play Store to the SKUs SDK via
fetchOrderCredentials. During this time, the Origin preferences screen
opens but credentials aren't ready yet.
- Disable all toggles and clickable preferences until
fetchOrderCredentials completes
- Show a snackbar with "Disabling features" spinner instead of
"Restart now" during the credential fetch
- On success, re-enable preferences and transition to "Restart now"
- On failure, close the preferences screen
- Always show restart snackbar on toggle change regardless of
setPolicyValue result, since failure means a restart is needed
- Remove duplicate color definitions (schemes_primary_fixed_dim,
schemes_on_primary_fixed, semantic_text_secondary,
semantic_text_tertiary) that already exist in nala tokens
Resolves: https://github.com/brave/brave-browser/issues/53915
Serg
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