fix(blog): make RSS feed discoverable site-wide (#262)

* fix(blog): make RSS feed discoverable site-wide

The RSS autodiscovery <link> only lived on the blog index and post
pages, so a feed reader pointed at the root domain (postguard.eu) or
any other marketing page found no feed. Move the autodiscovery link
into the marketing layout head so every public page advertises the
feed, and drop the now-redundant per-page duplicate on /blog/.

Refs encryption4all/postguard-business#58

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

* test(blog): add RSS autodiscovery regression test, dedupe post-page link

Replace the leftover SvelteKit skeleton test (asserted h1 ===
"Welcome to SvelteKit", which never matched this site) with a
regression test for the site-wide RSS autodiscovery link: it asserts
the <link rel="alternate" type="application/rss+xml"> is present
exactly once on /, /about/, /blog/, and a blog post page.

Also remove the now-redundant per-page RSS <svelte:head> block from
the blog post page — the marketing layout now provides the link
site-wide, so the per-page copy produced a duplicate on post pages.

Gitignore/prettierignore the Playwright artifact directories so the
test run leaves the tree clean.

Refs encryption4all/postguard-business#58

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

---------

Co-authored-by: dobby-yivi-agent[bot] <275734547+dobby-yivi-agent[bot]@users.noreply.github.com>
Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>

Author: dobby-coder[bot]

.gitignore

@@ -7,7 +7,14 @@ package
 .vscode
 .env.local
 .env.*.local
-*.pem 
+
+# Playwright
+/test-results
+/playwright-report
+/blob-report
+/playwright/.cache
+
+*.pem
 *.pub
 *.sec
 

.prettierignore

@@ -7,6 +7,8 @@ build/
 .svelte-kit/
 dist/
 node_modules/
+test-results/
+playwright-report/
 
 # Lockfiles
 package-lock.json

src/routes/(marketing)/+layout.svelte

@@ -19,6 +19,17 @@
     })
 </script>
 
+<svelte:head>
+    <!-- Site-wide RSS autodiscovery so feed readers pointed at any marketing
+         page (including the root domain) find the blog feed. -->
+    <link
+        rel="alternate"
+        type="application/rss+xml"
+        title="PostGuard Blog RSS Feed"
+        href="/blog/rss.xml"
+    />
+</svelte:head>
+
 {#if !$isLoading}
     <a class="sr-only sr-only-focusable skip-link" href="#main-content">
         {$_('common.skipToMain', { default: 'Skip to main content' })}

src/routes/(marketing)/blog/+page.svelte

@@ -54,15 +54,6 @@
     jsonLd={blogJsonLd}
 />
 
-<svelte:head>
-    <link
-        rel="alternate"
-        type="application/rss+xml"
-        title="PostGuard Blog RSS Feed"
-        href="/blog/rss.xml"
-    />
-</svelte:head>
-
 <div class="blog-index">
     <div class="header">
         <h1>Blog</h1>

src/routes/(marketing)/blog/[slug]/+page.svelte

@@ -64,15 +64,6 @@
     jsonLd={articleJsonLd}
 />
 
-<svelte:head>
-    <link
-        rel="alternate"
-        type="application/rss+xml"
-        title="PostGuard Blog RSS Feed"
-        href="/blog/rss.xml"
-    />
-</svelte:head>
-
 <article class="blog-post">
     <header>
         <div class="meta">

tests/rss-autodiscovery.test.ts

@@ -0,0 +1,30 @@
+import { expect, test } from '@playwright/test'
+
+const RSS_LINK =
+    'head > link[rel="alternate"][type="application/rss+xml"][href="/blog/rss.xml"]'
+
+// Regression test for the site-wide RSS autodiscovery link (issue
+// encryption4all/postguard-business#58). The autodiscovery <link> lives in the
+// marketing layout head, so every public page must advertise the blog feed
+// exactly once — including non-blog pages and blog pages, which must not carry
+// a leftover per-page duplicate.
+for (const path of ['/', '/about/', '/blog/']) {
+    test(`RSS autodiscovery link is present exactly once on ${path}`, async ({
+        page,
+    }) => {
+        await page.goto(path)
+        await expect(page.locator(RSS_LINK)).toHaveCount(1)
+    })
+}
+
+test('RSS autodiscovery link is present exactly once on a blog post page', async ({
+    page,
+}) => {
+    await page.goto('/blog/')
+    const firstPost = page.locator('a.post-card').first()
+    const href = await firstPost.getAttribute('href')
+    expect(href, 'expected at least one blog post link on /blog/').toBeTruthy()
+
+    await page.goto(href as string)
+    await expect(page.locator(RSS_LINK)).toHaveCount(1)
+})