v1.0.0 - Release: widget area, documentation refresh

- Register sidebar widget area via register_sidebar()
- Render WordPress widgets in Twig sidebar with fallback to built-in content
- Update README.md with accurate feature counts and descriptions
- Update translation files with widget area strings
- Bump version to 1.0.0

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

languages/fr_FR.po

@@ -904,6 +904,14 @@ msgstr "Navigation principale"
 msgid "Footer navigation"
 msgstr "Navigation du pied de page"
 
+#: functions.php
+msgid "Sidebar"
+msgstr "Barre latérale"
+
+#: functions.php
+msgid "Add widgets here to appear in the sidebar."
+msgstr "Ajoutez des widgets ici pour les afficher dans la barre latérale."
+
 #: views/partials/sidebar.html.twig
 msgid "Blog sidebar"
 msgstr "Barre latérale du blog"