chore: remove flat types

package.json

@@ -116,7 +116,6 @@
     "@antfu/ni": "^0.21.12",
     "@types/chroma-js": "^2.4.4",
     "@types/file-saver": "^2.0.7",
-    "@types/flat": "^5.0.5",
     "@types/fnando__sparkline": "^0.3.7",
     "@types/fs-extra": "^11.0.4",
     "@types/js-yaml": "^4.0.9",

pnpm-lock.yaml

@@ -265,9 +265,6 @@ importers:
       '@types/file-saver':
         specifier: ^2.0.7
         version: 2.0.7
-      '@types/flat':
-        specifier: ^5.0.5
-        version: 5.0.5
       '@types/fnando__sparkline':
         specifier: ^0.3.7
         version: 0.3.7
@@ -4777,10 +4774,6 @@ packages:
     resolution: {integrity: sha512-dNKVfHd/jk0SkR/exKGj2ggkB45MAkzvWCaqLUUgkyjITkGNzH8H+yUwr+BLJUBjZOe9w8X3wgmXhZDRg1ED6A==}
     dev: true
 
-  /@types/flat@5.0.5:
-    resolution: {integrity: sha512-nPLljZQKSnac53KDUDzuzdRfGI0TDb5qPrb+SrQyN3MtdQrOnGsKniHN1iYZsJEBIVQve94Y6gNz22sgISZq+Q==}
-    dev: true
-
   /@types/fnando__sparkline@0.3.7:
     resolution: {integrity: sha512-irYrS2clNGbnKBBIBAulPH6hDZ/HlBkNsDbYPfO8B2obcxtC9UzKFS5IBSzrUtfKbwf8U01xHj+5iEJ7TtY04Q==}
     dev: true