Fix types declaration entry path for clients/js (#647)

The package's `types` (and the `types` export condition) point to
`./dist/types/index.d.ts`, but the build emitted the entry to
`./dist/types/src/index.d.ts`, so consumers resolved no type
declarations at all (attw: "No types" on node10, node16, and bundler).

The cause was `include: ["src", "*.ts"]`: the `*.ts` glob pulled in
`tsup.config.ts` at the package root, which raised the declaration
rootDir to the package directory and prefixed all emitted declarations
with `src/`. Setting `rootDir: "src"` and narrowing `include` to
`["src"]` makes tsc emit the entry to the declared `./dist/types/index.d.ts`.

Co-authored-by: Jon <jon@anza.xyz>
Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: 3 people

clients/js/tsconfig.json

@@ -9,8 +9,9 @@
         "incremental": false,
         "declaration": true,
         "declarationDir": "./dist/types",
-        "emitDeclarationOnly": true
+        "emitDeclarationOnly": true,
+        "rootDir": "src"
     },
     "extends": ["@tsconfig/strictest/tsconfig.json"],
-    "include": ["src", "*.ts"]
+    "include": ["src"]
 }