feat(web): 用户工作台 - 产品化壳层、内容库布局与积分入口

Co-authored-by: Cursor <cursoragent@cursor.com>

web/test/settings-preference-spacing.test.ts

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+import { expect, test } from "bun:test";
+import { readFileSync } from "node:fs";
+import { resolve } from "node:path";
+
+test("settings page drops the page header copy and audio preference blocks", () => {
+    const source = readFileSync(resolve(import.meta.dir, "../src/pages/settings/index.tsx"), "utf8");
+    expect(source).not.toContain("创作偏好");
+    expect(source).not.toContain("配置默认模型、生成参数和素材存储。");
+    expect(source).not.toContain("音频默认值");
+    expect(source).not.toContain("音频指令");
+    expect(source).not.toContain("默认音频指令");
+    expect(source).toContain("默认生图张数");
+    expect(source).toContain("settings-preference-heading");
+});
+
+test("wallet tabs and preference blocks keep a visible gap from neighboring surfaces", () => {
+    const css = readFileSync(resolve(import.meta.dir, "../src/styles/globals.css"), "utf8");
+    expect(css).toContain(".workspace-wallet-tabs {");
+    expect(css).toContain("margin: 12px 24px 0;");
+    expect(css).toContain("margin: 16px 24px 24px;");
+    expect(css).toContain(".settings-preference-heading { margin-bottom: var(--space-5); }");
+    expect(css).toContain(".app-user-workspace.settings-page .settings-preference-block {\n    padding: 20px 20px 12px;");
+});