docs(design): remove SVG, use PNG logo only

SVG icon is no longer in use. public/logo.png (1024x1024 RGBA) is
the single logo asset. DESIGN.md updated accordingly: SVG snippet
removed, wordmark pattern and <head> references updated to PNG.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

node_modules/jiti/dist/utils.d.ts

@@ -0,0 +1,8 @@
+import type { PackageJson } from "pkg-types";
+export declare function getCacheDir(): string;
+export declare function isDir(filename: string): boolean;
+export declare function isWritable(filename: string): boolean;
+export declare function md5(content: string, len?: number): string;
+export declare function detectLegacySyntax(code: string): RegExpMatchArray | null;
+export declare function isObject(val: any): boolean;
+export declare function readNearestPackageJSON(path: string): PackageJson | undefined;