feat: improve setup README with card display, snippet, and clearer description

Author: unhappychoice

src/cli/commands/setup/workflows.test.ts

@@ -57,9 +57,9 @@ describe("buildReadme", () => {
     expect(readme).toMatch(/^# Dev Pulse/);
   });
 
-  it("includes username with link", () => {
+  it("includes github-weekly-reporter link", () => {
     const readme = buildReadme(baseOpts);
-    expect(readme).toContain("[@testuser](https://github.com/testuser)");
+    expect(readme).toContain("[github-weekly-reporter](https://github.com/deariary/github-weekly-reporter)");
   });
 
   it("includes pages URL", () => {

src/cli/commands/setup/workflows.ts

@@ -186,14 +186,24 @@ export const buildReadme = (opts: {
   const displayTitle = opts.siteTitle.replace(/\\n/g, " ");
   return `# ${displayTitle}
 
-Weekly GitHub activity reports for [@${opts.username}](https://github.com/${opts.username}), powered by [github-weekly-reporter](https://github.com/deariary/github-weekly-reporter).
+This repository is generated and updated by [github-weekly-reporter](https://github.com/deariary/github-weekly-reporter).
+
+Every week, GitHub Actions collects my activity (commits, PRs, reviews), an LLM writes a narrative summary, and the result is published as a blog-style report page and an animated profile card.
 
 ## Live Reports
 
 ${opts.pagesUrl}
 
 ## Profile Card
 
+<a href="https://github.com/${opts.repo}">
+  <picture>
+    <source media="(prefers-color-scheme: dark)" srcset="${opts.pagesUrl}/card-dark.svg" />
+    <source media="(prefers-color-scheme: light)" srcset="${opts.pagesUrl}/card.svg" />
+    <img alt="Weekly Report" src="${opts.pagesUrl}/card.svg" />
+  </picture>
+</a>
+
 Add this to your [GitHub Profile README](https://docs.github.com/en/account-and-profile/setting-up-and-managing-your-github-profile/customizing-your-profile/managing-your-profile-readme):
 
 \`\`\`html