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/providers/sync.d.ts

@@ -0,0 +1,10 @@
+import SyncReader from '../readers/sync';
+import type Settings from '../settings';
+import type { Entry } from '../types';
+export default class SyncProvider {
+    private readonly _root;
+    private readonly _settings;
+    protected readonly _reader: SyncReader;
+    constructor(_root: string, _settings: Settings);
+    read(): Entry[];
+}