fix: normalize BASE_URL trailing slash in post links and RSS feed

The Astro BASE_URL (/crashtestdev) lacked a trailing slash, causing
post URLs to render as /crashtestdevposts/... instead of
/crashtestdev/posts/... Breaking article card navigation and RSS feed
links.

Applied the same .replace(/\/?$/, '/') normalization pattern already
used in BaseLayout.astro to:
- ArticleCard.astro (card link hrefs)
- NavBar.astro (isActive path matching)
- rss.xml.ts (item link generation)

Also adds final-verification.test.mjs with 31 tests covering:
- Clean build output structure
- Index page cards, shadows, hover states, URL format
- Post page NavBar active state, PostHeader centering
- Three typography voices (prose/structure/evidence)
- Code block breakout width, warm background, terracotta border
- Design token color compliance
- Responsive behavior (nav stacking, title shrinking, gutter respect)
- RSS feed validity and URL correctness

src/components/ArticleCard.astro

@@ -9,7 +9,7 @@ interface Props {
 }
 
 const { title, date, type, summary, slug, readingTime } = Astro.props;
-const base = import.meta.env.BASE_URL;
+const base = import.meta.env.BASE_URL.replace(/\/?$/, '/');
 
 const formattedDate = date.toLocaleDateString('en-US', {
   year: 'numeric',

src/components/NavBar.astro

@@ -1,6 +1,6 @@
 ---
 const currentPath = Astro.url.pathname;
-const base = import.meta.env.BASE_URL;
+const base = import.meta.env.BASE_URL.replace(/\/?$/, '/');
 
 const navLinks = [
   { label: 'Posts', href: base },

src/pages/rss.xml.ts

@@ -4,7 +4,7 @@ import type { APIContext } from 'astro';
 
 export async function GET(context: APIContext) {
   const posts = await getCollection('posts');
-  const base = import.meta.env.BASE_URL;
+  const base = import.meta.env.BASE_URL.replace(/\/?$/, '/');
 
   const sortedPosts = posts.sort(
     (a, b) => b.data.date.getTime() - a.data.date.getTime()

tests/final-verification.test.mjs

@@ -0,0 +1,273 @@
+/**
+ * Final verification test suite for the Astro rebuild.
+ * Validates the built output against the design spec checklist.
+ */
+import { readFileSync, existsSync, readdirSync } from 'fs';
+import { execSync } from 'child_process';
+import { test, describe } from 'node:test';
+import assert from 'node:assert/strict';
+
+const DIST = 'dist';
+
+// Helper: read file as string
+function readDist(path) {
+  return readFileSync(`${DIST}/${path}`, 'utf-8');
+}
+
+// ============================================================
+// 1. Clean build produces expected output files
+// ============================================================
+describe('Clean build output', () => {
+  test('dist/index.html exists', () => {
+    assert.ok(existsSync(`${DIST}/index.html`));
+  });
+
+  test('dist/rss.xml exists', () => {
+    assert.ok(existsSync(`${DIST}/rss.xml`));
+  });
+
+  test('post pages exist', () => {
+    const postsDir = `${DIST}/posts`;
+    assert.ok(existsSync(postsDir));
+    const slugs = readdirSync(postsDir);
+    assert.ok(slugs.length >= 2, `Expected at least 2 post slugs, got ${slugs.length}`);
+  });
+});
+
+// ============================================================
+// 2. Index page structure
+// ============================================================
+describe('Index page', () => {
+  const html = readDist('index.html');
+
+  test('contains two article cards', () => {
+    const cardMatches = html.match(/<article[^>]*class="card"/g);
+    assert.ok(cardMatches, 'No article cards found');
+    assert.equal(cardMatches.length, 2, `Expected 2 article cards, got ${cardMatches.length}`);
+  });
+
+  test('card surface uses warm off-white (--surface-card)', () => {
+    assert.ok(html.includes('var(--surface-card)'), 'Card should use --surface-card token');
+  });
+
+  test('card has subtle shadow (--shadow-sm)', () => {
+    assert.ok(html.includes('var(--shadow-sm)'), 'Card should use --shadow-sm token');
+  });
+
+  test('card hover shows deeper shadow (--shadow-md)', () => {
+    assert.ok(html.includes('var(--shadow-md)'), 'Card hover should use --shadow-md token');
+  });
+
+  test('card hover shows terracotta title (--accent-primary)', () => {
+    assert.ok(
+      html.includes(':hover .title') || html.includes(':hover .title{'),
+      'Card hover should style the title'
+    );
+    assert.ok(html.includes('var(--accent-primary)'), 'Title hover should use terracotta accent');
+  });
+
+  test('card links have correct URL format with slash separator', () => {
+    // The base is /crashtestdev and posts must be at /crashtestdev/posts/...
+    const linkRegex = /href="([^"]*posts[^"]*)"/g;
+    let match;
+    let found = false;
+    while ((match = linkRegex.exec(html)) !== null) {
+      found = true;
+      const url = match[1];
+      assert.ok(
+        url.includes('/posts/'),
+        `URL "${url}" should contain "/posts/" with proper slash separator`
+      );
+      assert.ok(
+        !url.includes('devposts'),
+        `URL "${url}" should not concatenate base and posts without slash`
+      );
+    }
+    assert.ok(found, 'Should find article card links');
+  });
+});
+
+// ============================================================
+// 3. Post page structure
+// ============================================================
+describe('Post page', () => {
+  // Find first post
+  const postsDir = `${DIST}/posts`;
+  const firstSlug = readdirSync(postsDir)[0];
+  const html = readDist(`posts/${firstSlug}/index.html`);
+
+  test('has NavBar with site navigation', () => {
+    assert.ok(html.includes('aria-label="Site navigation"'), 'Should have site navigation');
+  });
+
+  test('NavBar has Posts link with active state (terracotta underline)', () => {
+    assert.ok(html.includes('nav-link'), 'Should have nav links');
+    // On post pages, the nav link should have the 'active' class
+    assert.ok(
+      html.includes('class="nav-link active"') || html.includes('active'),
+      'Should have active state on Posts link'
+    );
+    // Verify the source NavBar component defines the terracotta underline for active links
+    const navbar = readFileSync('src/components/NavBar.astro', 'utf-8');
+    assert.ok(
+      navbar.includes('text-decoration-color: var(--accent-primary)'),
+      'Active link should have terracotta underline defined in source'
+    );
+  });
+
+  test('has PostHeader with badge', () => {
+    assert.ok(html.includes('post-header'), 'Should have post-header');
+    assert.ok(html.includes('class="badge"'), 'Should have badge');
+  });
+
+  test('has PostHeader with title', () => {
+    assert.ok(html.includes('class="title"'), 'Should have title');
+  });
+
+  test('has PostHeader with date and reading time', () => {
+    assert.ok(html.includes('<time'), 'Should have date element');
+    assert.ok(html.includes('min read'), 'Should have reading time');
+  });
+
+  test('PostHeader is centered', () => {
+    // Astro scoped styles are compiled to external CSS files, not inline in HTML.
+    // Check the source component instead.
+    const postHeader = readFileSync('src/components/PostHeader.astro', 'utf-8');
+    assert.ok(
+      postHeader.includes('text-align: center'),
+      'PostHeader should be centered in source component'
+    );
+  });
+});
+
+// ============================================================
+// 4. Typography: Three distinct voices
+// ============================================================
+describe('Typography voices', () => {
+  const tokens = readFileSync('src/styles/tokens.css', 'utf-8');
+
+  test('Prose voice: Source Serif 4 via --font-prose', () => {
+    assert.ok(tokens.includes('--font-prose'));
+    assert.ok(tokens.includes('Source Serif 4'));
+  });
+
+  test('Structure voice: Inter via --font-structure', () => {
+    assert.ok(tokens.includes('--font-structure'));
+    assert.ok(tokens.includes('Inter'));
+  });
+
+  test('Evidence voice: JetBrains Mono via --font-evidence', () => {
+    assert.ok(tokens.includes('--font-evidence'));
+    assert.ok(tokens.includes('JetBrains Mono'));
+  });
+});
+
+// ============================================================
+// 5. Code blocks
+// ============================================================
+describe('Code blocks', () => {
+  const prose = readFileSync('src/styles/prose.css', 'utf-8');
+
+  test('break wider than prose (--width-code > --width-prose)', () => {
+    assert.ok(prose.includes('--width-code'), 'Code blocks should use --width-code');
+    const tokens = readFileSync('src/styles/tokens.css', 'utf-8');
+    const proseWidth = tokens.match(/--width-prose:\s*([^;]+)/)?.[1]?.trim();
+    const codeWidth = tokens.match(/--width-code:\s*([^;]+)/)?.[1]?.trim();
+    assert.ok(parseFloat(codeWidth) > parseFloat(proseWidth),
+      `Code width (${codeWidth}) must be larger than prose width (${proseWidth})`);
+  });
+
+  test('warm background (#EEEAE2 via --surface-code)', () => {
+    const tokens = readFileSync('src/styles/tokens.css', 'utf-8');
+    assert.ok(tokens.includes('--surface-code: #EEEAE2'));
+  });
+
+  test('3px terracotta left border', () => {
+    assert.ok(prose.includes('border-left: 3px solid var(--accent-primary)'));
+  });
+});
+
+// ============================================================
+// 6. Design token colors
+// ============================================================
+describe('Design token colors', () => {
+  const tokens = readFileSync('src/styles/tokens.css', 'utf-8');
+
+  test('page background #F5F0E8', () => {
+    assert.ok(tokens.includes('#F5F0E8'), 'Should have #F5F0E8 as surface-base');
+  });
+
+  test('text color #2B2421', () => {
+    assert.ok(tokens.includes('#2B2421'), 'Should have #2B2421 as text-primary');
+  });
+
+  test('link color #A0522D', () => {
+    assert.ok(tokens.includes('#A0522D'), 'Should have #A0522D as accent-primary');
+  });
+});
+
+// ============================================================
+// 7. Responsive design
+// ============================================================
+describe('Responsive behavior', () => {
+  test('NavBar stacks on mobile', () => {
+    const navbar = readFileSync('src/components/NavBar.astro', 'utf-8');
+    assert.ok(navbar.includes('flex-direction: column') || navbar.includes('flex-direction:column'),
+      'Nav should stack on mobile');
+    assert.ok(navbar.includes('@media'), 'Should have responsive media query');
+  });
+
+  test('PostHeader title shrinks on mobile', () => {
+    const header = readFileSync('src/components/PostHeader.astro', 'utf-8');
+    assert.ok(header.includes('@media'), 'PostHeader should have responsive media queries');
+    // Check that smaller type sizes are used at breakpoints
+    assert.ok(header.includes('--type-2xl') || header.includes('--type-xl'),
+      'Title should use smaller type scale at breakpoints');
+  });
+
+  test('code blocks respect gutters on mobile', () => {
+    const prose = readFileSync('src/styles/prose.css', 'utf-8');
+    assert.ok(prose.includes('100vw') && prose.includes('--gutter'),
+      'Code blocks should constrain to viewport minus gutters');
+  });
+});
+
+// ============================================================
+// 8. RSS feed
+// ============================================================
+describe('RSS feed', () => {
+  const rss = readDist('rss.xml');
+
+  test('is valid XML (starts with xml declaration)', () => {
+    assert.ok(rss.startsWith('<?xml'), 'RSS should start with XML declaration');
+  });
+
+  test('contains channel with title', () => {
+    assert.ok(rss.includes('<title>Crash Test Dev</title>'));
+  });
+
+  test('contains at least 2 items', () => {
+    const items = rss.match(/<item>/g);
+    assert.ok(items && items.length >= 2, `Expected at least 2 RSS items, got ${items?.length}`);
+  });
+
+  test('item links have correct URL format', () => {
+    // RSS links should be full URLs with proper path
+    const linkRegex = /<link>(https?:\/\/[^<]+posts[^<]*)<\/link>/g;
+    let match;
+    let found = false;
+    while ((match = linkRegex.exec(rss)) !== null) {
+      found = true;
+      const url = match[1];
+      assert.ok(
+        url.includes('/posts/'),
+        `RSS URL "${url}" should contain "/posts/" with proper slash separator`
+      );
+      assert.ok(
+        !url.includes('devposts'),
+        `RSS URL "${url}" should not concatenate base and posts without slash`
+      );
+    }
+    assert.ok(found, 'Should find post links in RSS');
+  });
+});