fix: decode WordPress title entities before Twig to prevent double-encoding (v1.0.10)

WordPress's get_the_title() pre-encodes & as &. Twig autoescape
re-encoded the & in & to &, rendering as literal &
in the browser. Wrapped all 6 get_the_title() calls in ContextBuilder
with wp_specialchars_decode() so Twig can properly re-encode once.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

CHANGELOG.md

@@ -2,6 +2,12 @@
 
 All notable changes to this project will be documented in this file.
 
+## [1.0.10] - 2026-02-25
+
+### Fixed
+
+- **Title double-encoding in Twig templates** (`inc/Template/ContextBuilder.php`): WordPress's `get_the_title()` pre-encodes `&` as `&`. When passed to Twig with autoescape enabled, the `&` in `&` was escaped again to `&`, rendering as literal `&` in the browser (e.g. "Bewerbungen & Nachrichten" instead of "Bewerbungen & Nachrichten"). Fixed by wrapping all 6 `get_the_title()` calls with `wp_specialchars_decode()` to decode WordPress entities before Twig. Twig autoescape then properly re-encodes `&` → `&`. This is XSS-safe because Twig still escapes all output.
+
 ## [1.0.9] - 2026-02-19
 
 ### Performance

CLAUDE.md

@@ -234,6 +234,20 @@ Build steps (in order):
 
 ## Session History
 
+### Session 16 — v1.0.10 Title Double-Encoding Fix (2026-02-25)
+
+**Completed:** Fixed double-encoding of HTML entities in page titles rendered through Twig.
+
+**Root cause:** WordPress's `get_the_title()` returns titles with HTML entities pre-encoded (e.g. `&` → `&`). `ContextBuilder` passed these pre-encoded strings to Twig as template variables. Twig's autoescape then re-encoded the `&` in `&` to `&`, which browsers rendered as the literal text `&` instead of `&`. Affected all pages with `&` in their title (e.g. help pages "Bewerbungen & Nachrichten", "Konto & Sicherheit", "Abonnements & Abrechnung").
+
+**Fix:** Wrapped all 6 `get_the_title()` calls in `ContextBuilder.php` with `wp_specialchars_decode()`. This decodes WordPress entities back to raw characters before Twig, allowing Twig autoescape to properly encode them once. XSS-safe because Twig still escapes all output.
+
+**Files modified:**
+
+- `inc/Template/ContextBuilder.php` — `wp_specialchars_decode()` on all 6 `get_the_title()` calls
+- `style.css` — version bump to 1.0.10
+- `CHANGELOG.md` — v1.0.10 entry
+
 ### Session 15 — v1.0.9 Performance Optimization (2026-02-19)
 
 **Completed:** Two targeted performance fixes for production environments.

inc/Template/ContextBuilder.php

@@ -153,7 +153,7 @@ class ContextBuilder
 
         return [
             'id'         => $post->ID,
-            'title'      => get_the_title(),
+            'title'      => wp_specialchars_decode( get_the_title() ),
             'url'        => get_permalink(),
             'content'    => apply_filters('the_content', get_the_content()),
             'excerpt'    => get_the_excerpt(),
@@ -184,7 +184,7 @@ class ContextBuilder
                 $wp_query->the_post();
                 $posts[] = [
                     'id'        => get_the_ID(),
-                    'title'     => get_the_title(),
+                    'title'     => wp_specialchars_decode( get_the_title() ),
                     'url'       => get_permalink(),
                     'excerpt'   => get_the_excerpt(),
                     'date'      => get_the_date(),
@@ -349,14 +349,14 @@ class ContextBuilder
 
         if ($prev) {
             $navigation['previous'] = [
-                'title' => get_the_title($prev),
+                'title' => wp_specialchars_decode( get_the_title($prev) ),
                 'url'   => get_permalink($prev),
             ];
         }
 
         if ($next) {
             $navigation['next'] = [
-                'title' => get_the_title($next),
+                'title' => wp_specialchars_decode( get_the_title($next) ),
                 'url'   => get_permalink($next),
             ];
         }
@@ -384,7 +384,7 @@ class ContextBuilder
                 $query->the_post();
                 $posts[] = [
                     'id'        => get_the_ID(),
-                    'title'     => get_the_title(),
+                    'title'     => wp_specialchars_decode( get_the_title() ),
                     'url'       => get_permalink(),
                     'date'      => get_the_date(),
                     'date_iso'  => get_the_date('c'),
@@ -438,7 +438,7 @@ class ContextBuilder
             while ($query->have_posts()) {
                 $query->the_post();
                 $posts[] = [
-                    'title' => get_the_title(),
+                    'title' => wp_specialchars_decode( get_the_title() ),
                     'url'   => get_permalink(),
                     'date'  => get_the_date(),
                 ];

style.css

@@ -7,7 +7,7 @@ Description: A modern WordPress Block Theme built from scratch with Bootstrap 5.
 Requires at least: 6.7
 Tested up to: 6.7
 Requires PHP: 8.3
-Version: 1.0.9
+Version: 1.0.10
 License: GNU General Public License v2 or later
 License URI: http://www.gnu.org/licenses/gpl-2.0.html
 Text Domain: wp-bootstrap