feat: offcanvas mobile navigation with user avatar and admin bar fix (v1.0.11)

Switch mobile nav from collapse to offcanvas, add logged-in user avatar
and My Account link to offcanvas header, move dark mode toggle to
offcanvas footer. Fix admin bar overlapping offcanvas via inline CSS.

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

functions.php

@@ -83,6 +83,13 @@ if ( ! function_exists( 'wp_bootstrap_enqueue_scripts' ) ) :
             $theme_version
         );
 
+        // Push offcanvas below the WP admin bar when logged in.
+        if ( is_admin_bar_showing() ) {
+            wp_add_inline_style( 'wp-bootstrap-style',
+                '.offcanvas { padding-top: var(--wp-admin--admin-bar--height, 32px); }'
+            );
+        }
+
         // Enqueue Bootstrap JS bundle (includes Popper).
         wp_enqueue_script(
             'wp-bootstrap-js',