feat: implement calendar management features including create, update, and delete functionalities

locales/en/common.json

@@ -1598,9 +1598,17 @@
     "nav_next": "Next",
     "import": {
       "title": "Import Calendar",
+      "tab_file": "File",
+      "tab_url": "URL",
       "select_file": "Select .ics file",
       "drop_file": "or drop file here",
       "supported_formats": "Supports iCalendar (.ics) files",
+      "url_description": "Enter the URL of an external iCalendar (.ics) feed to import events.",
+      "url_placeholder": "https://example.com/calendar.ics",
+      "url_hint": "Supports CalDAV and iCalendar (.ics) URLs",
+      "fetch": "Fetch",
+      "invalid_url": "Please enter a valid URL",
+      "url_fetch_failed": "Failed to fetch calendar from URL",
       "parsing": "Parsing calendar file...",
       "parsed_events": "{count} events found",
       "no_events": "No events found in file",
@@ -1613,6 +1621,65 @@
       "error": "Failed to import calendar",
       "file_too_large": "File exceeds 5MB limit",
       "invalid_format": "Invalid calendar file format"
+    },
+    "management": {
+      "title": "Calendar Management",
+      "description": "Create, rename, and customize your calendars. Right-click a calendar in the sidebar to quickly change its color.",
+      "name": "Name",
+      "name_placeholder": "Calendar name",
+      "color": "Color",
+      "change_color": "Change color",
+      "add_calendar": "Add calendar",
+      "edit": "Edit",
+      "delete": "Delete",
+      "save": "Save",
+      "create": "Create",
+      "cancel": "Cancel",
+      "default": "Default",
+      "confirm_delete": "Delete \"{name}\"? All events in this calendar will be removed.",
+      "confirm_clear": "Clear all events from \"{name}\"? This cannot be undone.",
+      "clear_events": "Clear events",
+      "events_cleared": "{count} events cleared",
+      "error_clear": "Failed to clear calendar events",
+      "calendar_created": "Calendar created",
+      "calendar_updated": "Calendar updated",
+      "calendar_deleted": "Calendar deleted",
+      "color_updated": "Calendar color updated",
+      "error_create": "Failed to create calendar",
+      "error_update": "Failed to update calendar",
+      "error_delete": "Failed to delete calendar",
+      "caldav_url": "CalDAV URL",
+      "copy_url": "Copy CalDAV URL",
+      "url_copied": "CalDAV URL copied to clipboard"
+    },
+    "subscription": {
+      "title": "iCal Subscription",
+      "section_title": "iCal Subscriptions",
+      "description": "Subscribe to an external iCalendar feed. Events will be synced automatically into their own calendar.",
+      "url_label": "Calendar URL",
+      "url_placeholder": "https://example.com/calendar.ics",
+      "name_label": "Calendar name",
+      "name_placeholder": "e.g. Public Holidays",
+      "color_label": "Color",
+      "refresh_interval": "Refresh interval",
+      "interval_15": "Every 15 minutes",
+      "interval_30": "Every 30 minutes",
+      "interval_60": "Every hour",
+      "interval_360": "Every 6 hours",
+      "interval_1440": "Every day",
+      "subscribe": "Subscribe",
+      "subscribing": "Subscribing...",
+      "invalid_url": "Please enter a valid URL",
+      "success": "Subscribed to \"{name}\"",
+      "error": "Failed to add subscription",
+      "refresh": "Refresh now",
+      "refresh_success": "Subscription refreshed",
+      "refresh_error": "Failed to refresh subscription",
+      "unsubscribe": "Unsubscribe",
+      "confirm_delete": "Unsubscribe from \"{name}\"? The calendar and all its events will be removed.",
+      "deleted": "Subscription removed",
+      "delete_error": "Failed to remove subscription",
+      "last_refreshed": "Last updated: {time}"
     }
   },
   "advanced_search": {