fix: add types conditions to package exports for nodenext resolution

TypeScript with moduleResolution nodenext/node16 ignores the top-level
"types" field when an "exports" map is present. Without a "types"
condition inside each export, consumers got TS7016 "Could not find a
declaration file for module 'sql-render'".

Author: bug3

package.json

@@ -1,6 +1,6 @@
 {
   "name": "sql-render",
-  "version": "0.3.1",
+  "version": "0.3.2",
   "description": "Type-safe {{variable}} templating for .sql files with built-in injection protection",
   "author": "bug3",
   "repository": {
@@ -16,8 +16,14 @@
   "types": "./dist/index.d.ts",
   "exports": {
     ".": {
-      "import": "./dist/index.mjs",
-      "require": "./dist/index.cjs"
+      "import": {
+        "types": "./dist/index.d.mts",
+        "default": "./dist/index.mjs"
+      },
+      "require": {
+        "types": "./dist/index.d.ts",
+        "default": "./dist/index.cjs"
+      }
     }
   },
   "files": [