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/wp-bootstrap.pot

@@ -2,7 +2,7 @@
 # This file is distributed under the same license as the WP Bootstrap theme.
 msgid ""
 msgstr ""
-"Project-Id-Version: WP Bootstrap 0.3.0\n"
+"Project-Id-Version: WP Bootstrap 1.0.0\n"
 "Report-Msgid-Bugs-To: https://src.bundespruefstelle.ch/magdev/wp-bootstrap/issues\n"
 "POT-Creation-Date: 2026-02-08 00:00+0000\n"
 "MIME-Version: 1.0\n"
@@ -903,6 +903,14 @@ msgstr ""
 msgid "Footer navigation"
 msgstr ""
 
+#: functions.php
+msgid "Sidebar"
+msgstr ""
+
+#: functions.php
+msgid "Add widgets here to appear in the sidebar."
+msgstr ""
+
 #: views/partials/sidebar.html.twig
 msgid "Blog sidebar"
 msgstr ""