fix(navigation): let CSS size the nav logo and drop the inline width cap

The navbar logo carried an inline `height:36px;width:auto;max-width:{logo_width}px`
while `.navbar-logo > img` already owns `height:36px;padding:0 30px`. Under
`box-sizing:border-box` that max-width capped the border box, so the 60px of
horizontal padding stayed inside it and wide logos were squeezed against a
fixed height, breaking the intrinsic aspect ratio.

- Render the nav logo with no inline sizing; CSS alone sizes it.
- Add a `$lazy` argument to jio_get_adaptive_theme_img() so the navbar can emit
  the real src up front instead of a square lazyload placeholder; defaults to
  'auto' so every other caller keeps the lazy_other behaviour.
- Remove the superseded logo_width plumbing: the setting (PHP + VUE schemas),
  Settings::logo_width(), jio_get_site_logo_width(), the --jio-logo-width token
  and the unused has_logo context key.
- Cover the contract in the header reference test.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

src/Admin/Schema/GlobalSchema.php

@@ -158,7 +158,6 @@ class GlobalSchema {
                         ['key' => 'logo', 'title' => 'Logo 设置', 'fields' => [
                             ['key' => 'site_logo', 'label' => '站点 Logo', 'type' => 'media', 'default' => ''],
                             ['key' => 'site_logo_dark', 'label' => '暗色模式 Logo', 'type' => 'media', 'default' => ''],
-                            ['key' => 'logo_width', 'label' => 'Logo 宽度', 'type' => 'number', 'default' => 150, 'min' => 50, 'max' => 400],
                             ['key' => 'logo_text', 'label' => 'Logo 文字', 'type' => 'input', 'default' => ''],
                         ]],
                         ['key' => 'favicon', 'title' => '站点图标', 'fields' => [

src/Frontend/InlineStyleBuilder.php

@@ -18,7 +18,6 @@ class InlineStyleBuilder {
         $main_radius    = class_exists('\Jio\Settings\Settings') ? \Jio\Settings\Settings::main_radius() : 12;
         $container_max  = class_exists('\Jio\Settings\Settings') ? \Jio\Settings\Settings::container_max_width() : 1200;
         $font_family    = class_exists('\Jio\Settings\Settings') ? \Jio\Settings\Settings::font_family() : 'system';
-        $logo_width     = class_exists('\Jio\Settings\Settings') ? \Jio\Settings\Settings::logo_width() : 150;
         $sidebar_cfg    = class_exists('\Jio\Settings\Settings') ? \Jio\Settings\Settings::get_sidebar_config() : ['width' => 311, 'enabled' => true, 'position' => 'right'];
 		$list_settings = class_exists('\Jio\Settings\Settings') ? \Jio\Settings\Settings::get_post_list_style_settings() : [];
 
@@ -47,7 +46,6 @@ class InlineStyleBuilder {
             '--font-display'           => $font_stacks['display'],
             '--font-ui'                => $font_stacks['ui'],
             '--font-heading'           => $font_stacks['ui'],
-            '--jio-logo-width'       => $logo_width . 'px',
             '--nav-height'             => '60px',
         ];
 

src/Settings/DisplayPageGroups.php

@@ -149,7 +149,6 @@ trait DisplayPageGroups {
             'site_logo'                   => self::logo_url(),
             'site_logo_dark'              => self::logo_dark_url(),
             'logo_text'                   => self::logo_text(),
-            'logo_width'                  => self::logo_width(),
             'site_favicon'                => self::favicon_url(),
             'theme_mode'                  => self::theme_mode(),
             'theme_mode_button'           => self::get_theme_mode_button_positions(),

src/Settings/FacadeBulk.php

@@ -199,14 +199,6 @@ trait FacadeBulk {
 
 
 
-    /** 获取导航 Logo 宽度 */
-    public static function logo_width(): int {
-        $width = (int) self::get_value('logo_width', 150);
-        return max(50, min(400, $width));
-    }
-
-
-
     /** 获取Favicon URL */
     public static function custom_favicon_url(): string {
         $favicon = (string) self::get_value('site_favicon', '');