fix: various small fixes and improvements

- Add 'skipped' to authentication result enum in OpenAPI spec
- Fix optional chaining on bimiResult.details check
- Add rbls field to AppConfig interface
- Restrict theme storage to valid 'light'/'dark' values only
- Fix null coalescing for blacklist result data
- Fix survey source to use domain instead of ip

api/openapi.yaml

@@ -789,7 +789,7 @@ components:
       properties:
         result:
           type: string
-          enum: [pass, fail, invalid, missing, none, neutral, softfail, temperror, permerror, declined, domain_pass, orgdomain_pass]
+          enum: [pass, fail, invalid, missing, none, neutral, softfail, temperror, permerror, declined, domain_pass, orgdomain_pass, skipped]
           description: Authentication result
           example: "pass"
         domain: