Fixes the three real CI failures:
- unit-tests: get_spa_template_context called common_bootstrap_payload()
a second time just to derive the language pack context, which requires
user/auth request state that tests mocking get_spa_payload don't set
up. get_language_pack_template_context now takes the already-built
common payload dict, so template context and payload can't diverge
and the theme-helper tests pass unchanged.
- test-sqlite/mysql/postgres: register the deliberately-unauthenticated
language_pack_script route in test_views_are_secured's allowlist with
its justification (static public catalog data, must load for
anonymous principals).
- lint-frontend: type the preamble test fixture as LanguagePack
(plural_forms was missing) via a type-only import that the jest
module mock doesn't affect.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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