fix(create-rslib): drop unused svelte config files

Remove svelte.config files from the Svelte templates so generated projects only keep configuration that is actually used.

Author: elecmonkey

packages/create-rslib/template-svelte-js/svelte.config.js

@@ -25,7 +25,6 @@
     "@types/node": "^24.12.4",
     "svelte": "^5.55.5",
     "svelte-check": "^4.4.8",
-    "svelte-preprocess": "^6.0.3",
     "svelte2tsx": "^0.7.55",
     "typescript": "^6.0.3"
   },

packages/create-rslib/template-svelte-ts/package.json

@@ -120,7 +120,6 @@ export const createAndValidate = (
       expect(pkgJson.scripts.check).toBe(
         'svelte-check --tsconfig ./tsconfig.json',
       );
-      expect(existsSync(path.join(dir, 'svelte.config.ts'))).toBeTruthy();
       expect(
         existsSync(path.join(dir, 'scripts/rslib-plugin-svelte-dts.ts')),
       ).toBeTruthy();
@@ -130,7 +129,6 @@ export const createAndValidate = (
       expect(pkgJson.devDependencies['svelte-check']).toBeFalsy();
       expect(pkgJson.devDependencies.svelte2tsx).toBeFalsy();
       expect(pkgJson.scripts.check).toBeFalsy();
-      expect(existsSync(path.join(dir, 'svelte.config.js'))).toBeTruthy();
       expect(
         existsSync(path.join(dir, 'scripts/rslib-plugin-svelte-dts.ts')),
       ).toBeFalsy();