joeytrasatti-openai 1549756b78 Add appearance metadata to thread sections (#37898) ...

## What changed

- Add optional `icon` and `color` appearance fields to custom thread sections and expose them through the app-server protocol.
- Persist appearance metadata in SQLite and include it when listing sections or returning threads.
- Let `threadSection/update` preserve an omitted appearance, clear it with `null`, or replace it with a new value.
- Reject appearance fields larger than 64 bytes.

## Testing

- Cover protocol compatibility, persistence across restart, update and clear behavior, and field-length validation.

GitOrigin-RevId: 8f55ce4f42f8bd17aa5416848a85845f681953df

2026-08-10 23:32:42 +00:00

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