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feat: expand internationalization and add identity management

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This release significantly expands internationalization support and adds comprehensive identity management features.

Internationalization (i18n):
- Add 5 new languages: Spanish, Italian, German, Dutch, Portuguese
- Expand from 3 to 8 total supported languages
- Redesign language switcher for better scalability (dropdown UI)
- Complete translations for all features across all languages

Identity Management:
- Multiple sender identities with per-identity signatures
- Sub-addressing support (user+tag@domain.com)
- Context-aware tag suggestions for sub-addresses
- Identity badges in email viewer and list
- Full CRUD operations for managing identities

Newsletter Management:
- RFC 2369 List-Unsubscribe support (one-click unsubscribe)
- HTTP and mailto unsubscribe methods
- Security validation prevents XSS attacks
- Two-step confirmation with persistent dismissal

Security & Accessibility:
- Dark mode email readability (intelligent color transformation)
- WCAG 2.0 Level AA color contrast compliance
- Comprehensive XSS prevention with validation utilities
- Unit test coverage for security-critical code (57 validation tests)

Testing:
- Add unit tests for validation utilities
- Add unit tests for email sanitization
- Add unit tests for color transformation
- Full test coverage for XSS attack vectors
This commit is contained in:
Matthieu MALVACHE
2026-01-08 22:15:32 +01:00
committed by Matthieu MALVACHE
parent 0d68851b63
commit 5d273e2109
49 changed files with 11018 additions and 432 deletions
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app/global-error.tsx
+9 -2
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@@ -5,8 +5,15 @@ import { AlertTriangle, RefreshCw } from "lucide-react";
/**
* Global error boundary for the root layout.
* Note: This component cannot use translations since it's outside providers.
* It must render its own <html> and <body> tags as it replaces the root layout.
*
* IMPORTANT: Strings in this file CANNOT be translated.
* This global error boundary renders outside the root layout and has no access
* to providers (including next-intl). This is a Next.js limitation for
* catastrophic error handling. These English strings only appear during
* critical failures when the entire app crashes.
*
* The component must render its own <html> and <body> tags as it replaces
* the root layout entirely.
*/
export default function GlobalError({
error,