update plugin themes when plugin was updated (#20052)

packages/opencode/src/util/filesystem.ts

@@ -1,4 +1,4 @@
-import { chmod, mkdir, readFile, writeFile } from "fs/promises"
+import { chmod, mkdir, readFile, stat as statFile, writeFile } from "fs/promises"
 import { createWriteStream, existsSync, statSync } from "fs"
 import { lookup } from "mime-types"
 import { realpathSync } from "fs"
@@ -25,6 +25,13 @@ export namespace Filesystem {
     return statSync(p, { throwIfNoEntry: false }) ?? undefined
   }
 
+  export async function statAsync(p: string): Promise<ReturnType<typeof statSync> | undefined> {
+    return statFile(p).catch((e) => {
+      if (isEnoent(e)) return undefined
+      throw e
+    })
+  }
+
   export async function size(p: string): Promise<number> {
     const s = stat(p)?.size ?? 0
     return typeof s === "bigint" ? Number(s) : s