feat(caldav): implement CalDAV support with token management and calendar operations

src/i18n/en.json

@@ -294,7 +294,29 @@
     "passwordChanged": "Password changed",
     "passwordChangeFailed": "Error changing password",
     "passwordMismatch": "Passwords do not match",
-    "selectLanguage": "Select language"
+    "selectLanguage": "Select language",
+    "caldav": {
+      "title": "CalDAV",
+      "subtitle": "Connect your calendar app (e.g. Apple Calendar, Thunderbird, DAVx⁵) using the CalDAV protocol. Use your email address and an app token as password.",
+      "serverUrl": "Server URL",
+      "username": "Username (Email)",
+      "hint": "Never enter your real Redlight password in a calendar app. Use an app token instead.",
+      "newToken": "Generate new app token",
+      "tokenNamePlaceholder": "e.g. \"iPhone\" or \"Thunderbird\"",
+      "generate": "Generate",
+      "existingTokens": "Active tokens",
+      "noTokens": "No tokens created yet.",
+      "created": "Created",
+      "lastUsed": "Last used",
+      "revoke": "Revoke",
+      "revokeConfirm": "Really revoke this token? All connected calendar apps using this token will lose access.",
+      "revoked": "Token revoked",
+      "revokeFailed": "Could not revoke token",
+      "createFailed": "Could not create token",
+      "newTokenCreated": "Token created — copy it now!",
+      "newTokenHint": "This token will only be shown once. Copy it and enter it as the password in your calendar app.",
+      "dismiss": "I have copied the token"
+    }
   },
   "themes": {
     "selectTheme": "Select theme",