New Plugin: Custom DM notification sounds

[XliteChase]

Summary

Adds CustomDMNotificationSound, a plugin that lets users set custom DM notification sounds for specific users.

Features

• Adds a user context menu entry to assign a custom DM sound
• Supports multiple users, up to 10 configured sounds
• Allows changing, previewing, and removing user-specific sounds
• Stores selected audio files in Vencord settings as data URLs
• Adds a 2 MB per-file limit to avoid oversized settings
• Cleans up active audio playback and message cache when the plugin stops

Review Fixes Addressed

• Added error handling for failed file reads
• Added stop() cleanup
• Added plugin README
• Avoids storing proxied settings objects by cloning custom sound data before writes

Testing

• pnpm exec eslint src/plugins/customDmNotificationSound/index.tsx src/utils/constants.ts
• pnpm testTsc
• pnpm generatePluginJson

[gemini-code-assist]

Code Review

This pull request introduces the CustomDMNotificationSound plugin, which allows users to assign custom audio files to specific direct message notifications. The implementation includes a settings manager, context menu options for users, and a patch to Discord's internal sound logic. Feedback from the review highlights the need to reduce the maximum file size limit to 512 KB to avoid performance issues with settings synchronization. Other suggestions include fixing a bug in the sound interception logic that could lead to redundant sounds during UI re-renders, addressing a race condition when updating settings, extending support to Group DMs, and ensuring legacy data is cleaned up after migration.