Remove notification delay configuration from updates settings

[timche]

Summary

This PR removes the notification delay feature from the update notification system, simplifying the update notification logic to always notify immediately when an update is available.

Key Changes

• Removed notification delay logic from packages/app/updater.ts:

  • Deleted NOTIFICATION_DELAY_MS configuration object
  • Removed isUrgentRelease() and flattenReleaseNotes() helper functions
  • Removed handleUpdateDownloaded(), clearPendingNotification(), and notifyRenderer() methods
  • Simplified update-downloaded handler to immediately send notification via IPC
  • Removed instance variables pendingVersion and notifyTimer

• Removed UI controls from packages/renderer-main/routes/settings/updates.tsx:

  • Deleted the "Notification Delay" select field and its configuration
  • Removed related imports and state management code
  • Kept only the "Show Notifications" toggle

• Updated configuration schema in packages/shared/types.ts:

  • Removed "updates.notificationDelay" type definition from Config

• Updated default config in packages/app/config.ts:

  • Removed "updates.notificationDelay": "next-day" from defaults
  • Added migration for version >3.45.0 to clean up the setting from existing user configs

Implementation Details

The update notification system now operates in a single mode: when an update is downloaded and notifications are enabled, it immediately notifies the renderer without any delay or urgency-based logic. This reduces complexity while maintaining the core functionality of alerting users to available updates.

https://claude.ai/code/session_017K2CRC6vh3WfisvKkTm32K