rebrand: Workavia Mail (tier 1+2+3+4)

Tier 1+2 - web/UI user-facing:
- Replace all visible "Twake Mail" / "Linagora" with "Workavia Mail"
- Swap 3 logo SVGs (icon kept, wordmark replaced via SVG <text>)
- Splash: replace icon_twp.png with HTML <div>Workavia</div>
- Remove power_by_linagora.svg, replace with AGPL SourceLinkWidget
- Patch web/index.html, manifest.json, login/logout-callback HTMLs
- Patch all 16 ARB locales + scribe ARB + app_localizations.dart
- Patch 4 web/i18n/*.json (FR/EN/DE/VI smart banner titles)
- App grid reduced to "Mail" + "Calendar"
- User-Agent: Twake-Mail -> Workavia-Mail

Tier 3+4 - mobile native:
- Bundle ID: com.linagora.{android,ios}.teammail -> com.workavia.mail
- URL schemes consolidated: teammail.mobile/twakemail.mobile -> workaviamail.mobile
- Android: applicationId, namespace, AndroidManifest, strings.xml
- Android: move Kotlin sources com.linagora.android.tmail -> com.workavia.mail
- Android: empty branding.xml + android12branding.xml (vector text not patchable)
- iOS: Info.plist (CFBundleDisplayName/Name, schemes), Runner.entitlements
- iOS: TwakeMailNSE + TeamMailShareExtension entitlements + Info.plist
- iOS: Runner.xcodeproj (12x PRODUCT_BUNDLE_IDENTIFIER, 9x APP_GROUP_ID)
- iOS: TokenRefreshManager.swift redirect URLs
- iOS: fastlane Appfile + Matchfile
- Dart: oidc_constant, app_config keychain, notification MethodChannel

Known follow-ups (require user action):
- Apple Team ID KUT463DS29 (still Linagora) -> needs Workavia team for App Store
- Android branding.xml emptied: need PNG/path-converted wordmark for splash
- iOS sub-bundle paths (TwakeMailNSE/, TeamMailShareExtension/) on disk unchanged
- iOS App Store URL emptied; Play Store ID points to com.workavia.mail

lib/l10n/intl_de.arb

@@ -41,7 +41,7 @@
     "placeholders_order": [],
     "placeholders": {}
   },
-  "login_text_slogan": "Twake Mail",
+  "login_text_slogan": "V-Mail",
   "@login_text_slogan": {
     "type": "text",
     "placeholders_order": [],
@@ -3299,7 +3299,7 @@
     "placeholders_order": [],
     "placeholders": {}
   },
-  "languageSubtitle": "Legen Sie die Sprache fest, die Sie in Twake Mail verwenden.",
+  "languageSubtitle": "Legen Sie die Sprache fest, die Sie in V-Mail verwenden.",
   "@languageSubtitle": {
     "type": "text",
     "placeholders_order": [],
@@ -3459,7 +3459,7 @@
     "placeholders_order": [],
     "placeholders": {}
   },
-  "page_name": "Twake Mail",
+  "page_name": "V-Mail",
   "@page_name": {
     "type": "text",
     "placeholders_order": [],
@@ -3483,7 +3483,7 @@
     "placeholders_order": [],
     "placeholders": {}
   },
-  "app_name": "Twake Mail",
+  "app_name": "V-Mail",
   "@app_name": {
     "type": "text",
     "placeholders_order": [],
@@ -3567,7 +3567,7 @@
     "placeholders_order": [],
     "placeholders": {}
   },
-  "pleaseAllowNotifications": "Bitte erlauben Sie Benachrichtigungen von Twake Mail in den Einstellungen des Geräts",
+  "pleaseAllowNotifications": "Bitte erlauben Sie Benachrichtigungen von V-Mail in den Einstellungen des Geräts",
   "@pleaseAllowNotifications": {
     "type": "text",
     "placeholders_order": [],
@@ -3645,7 +3645,7 @@
     "placeholders_order": [],
     "placeholders": {}
   },
-  "appTitlePushNotification": "Twake Mail",
+  "appTitlePushNotification": "V-Mail",
   "@appTitlePushNotification": {
     "type": "text",
     "placeholders_order": [],
@@ -3663,7 +3663,7 @@
     "placeholders_order": [],
     "placeholders": {}
   },
-  "bannerProgressingRecoveryMessage": "Die Wiederherstellung ist im Gange. Sie können Twake Mail weiterhin verwenden",
+  "bannerProgressingRecoveryMessage": "Die Wiederherstellung ist im Gange. Sie können V-Mail weiterhin verwenden",
   "@bannerProgressingRecoveryMessage": {
     "type": "text",
     "placeholders_order": [],
@@ -3917,7 +3917,7 @@
     "placeholders_order": [],
     "placeholders": {}
   },
-  "allowsTwakeMailToNotifyYouWhenANewMessageArrivesOnYourPhone": "Erlaubt Twake Mail, Sie zu benachrichtigen, wenn eine neue Nachricht auf Ihrem Telefon ankommt",
+  "allowsTwakeMailToNotifyYouWhenANewMessageArrivesOnYourPhone": "Erlaubt V-Mail, Sie zu benachrichtigen, wenn eine neue Nachricht auf Ihrem Telefon ankommt",
   "@allowsTwakeMailToNotifyYouWhenANewMessageArrivesOnYourPhone": {
     "type": "text",
     "placeholders_order": [],
@@ -4117,13 +4117,13 @@
     "placeholders_order": [],
     "placeholders": {}
   },
-  "createTwakeIdFailed": "Erstellen der Twake-ID fehlgeschlagen. Bitte überprüfen Sie Ihre Eingaben.",
+  "createTwakeIdFailed": "Erstellen der Workavia-ID fehlgeschlagen. Bitte überprüfen Sie Ihre Eingaben.",
   "@createTwakeIdFailed": {
     "type": "text",
     "placeholders_order": [],
     "placeholders": {}
   },
-  "createTwakeId": "Twake-ID erstellen",
+  "createTwakeId": "Workavia-ID erstellen",
   "@createTwakeId": {
     "type": "text",
     "placeholders_order": [],