Integrates latest TenantPilot platform changes from `platform-dev` into `dev`.
This PR was created by agent on user request; do not merge automatically.
Co-authored-by: Ahmed Darrazi <ahmed.darrazi@live.de>
Reviewed-on: #302
## Summary
- add the localization v1 foundation with request-time locale resolution and workspace or user preference handling
- localize the first-wave platform surfaces for auth, shell, dashboards, findings, baseline compare, and review workspace chrome
- add Pest coverage for locale resolution, preference flows, fallback behavior, notifications, and governance surface localization
## Scope
- active spec: specs/252-platform-localization-v1
- target branch: dev
## Notes
- machine-readable artifacts remain invariant and are not localized in this slice
- the branch includes the related spec kit artifacts for the feature
Co-authored-by: Ahmed Darrazi <ahmed.darrazi@live.de>
Reviewed-on: #293
