fix(napi): enable napi tracing feature in vite_task_client_napi

napi-derive emits `napi::bindgen_prelude::tracing` references when its
`tracing` feature is active. In a workspace where another napi consumer
(e.g. rolldown's binding in Vite+) turns that on via feature unification,
`vite_task_client_napi` failed to compile because its `napi` dependency
lacked the matching `tracing` feature. Enable it so the embedded addon
builds regardless of how napi-derive's features are unified downstream.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Author: wan9chi

crates/vite_task_client_napi/Cargo.toml

@@ -12,7 +12,7 @@ test = false
 doctest = false
 
 [dependencies]
-napi = { workspace = true, features = ["napi6"] }
+napi = { workspace = true, features = ["napi6", "tracing"] }
 napi-derive = { workspace = true }
 vite_str = { workspace = true }
 vite_task_client = { workspace = true }