[New Extension Manager] Installed plugins are missing descriptions

[ElykDeer]

Version and Platform (required):

• Binary Ninja Version: 5.4.9465-dev Ultimate, 8dfc71b4
• OS: macos
• OS Version: 26.4.1
• CPU Architecture: arm64

Bug Description:
Installed plugins do not have descriptions.

Steps To Reproduce:

1. Open plugin manager
2. Install plugin
3. Restart
4. Descriptions are gone

Expected Behavior:
I expect all plugins to show all their metadata

Screenshots: