chore: apply oxlint fix-suggestions (unused imports + useless fragments)

Scoped to only `no-unused-vars` and `react/jsx-no-useless-fragment` —
the safe subset of --fix-suggestions. Primary changes:

- Remove unused named imports from statements
- Remove unused default/type imports entirely
- Collapse `<><Single/></>` fragments to `<Single/>`

Verified clean: typecheck + format + lint all green.

packages/server/src/client/daemon-client.test.ts

@@ -3,7 +3,6 @@ import { DaemonClient, type DaemonTransport } from "./daemon-client";
 import {
   asUint8Array,
   decodeTerminalResizePayload,
-  decodeTerminalSnapshotPayload,
   decodeTerminalStreamFrame,
   encodeTerminalSnapshotPayload,
   encodeTerminalStreamFrame,