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/@nodelib/fs.walk/out/readers/common.d.ts

@@ -0,0 +1,7 @@
+import type { FilterFunction } from '../settings';
+import type Settings from '../settings';
+import type { Errno } from '../types';
+export declare function isFatalError(settings: Settings, error: Errno): boolean;
+export declare function isAppliedFilter<T>(filter: FilterFunction<T> | null, value: T): boolean;
+export declare function replacePathSegmentSeparator(filepath: string, separator: string): string;
+export declare function joinPathSegments(a: string, b: string, separator: string): string;