v0.2.2: kill white WP admin gutters (CSS only)

- #wpcontent / #wpbody / #wpbody-content set to dark page bg (#14181C)
  on both PR Vision screens; WP default left-padding on #wpcontent removed
- .wrap>h1 text colour set to light token (#EEF2F5) so the dashboard H1
  renders on dark, not white
- .notice.prv-proxy-note overridden to dark surface with teal left border
- Scoped strictly: entire block delivered via wp_add_inline_style('wp-admin',...)
  inside PRV_Admin_Page::enqueue_assets() which guards on strpos($hook, 'pr-vision')
  — fires only on the two PR Vision screens; does not touch WP admin bar or menu
- No logic change; files <300 lines; CHANGELOG + version bump included

pr-vision.php

@@ -3,7 +3,7 @@
  * Plugin Name: PR Vision
  * Plugin URI:  https://peptiderepo.com
  * Description: Weekly server-side LLM probes for AI-visibility (GEO) tracking. Records whether peptiderepo.com is cited by LLMs across core peptides, stores time-series, and renders an admin dashboard + settings UI.
- * Version:     0.2.1
+ * Version:     0.2.2
  * Author:      peptiderepo
  * Author URI:  https://peptiderepo.com
  * License:     GPL-2.0-or-later
@@ -24,7 +24,7 @@ if ( ! defined( 'ABSPATH' ) ) {
 
 /* ── Constants ────────────────────────────────────────────────────────── */
 
-define( 'PRV_VERSION', '0.2.1' );
+define( 'PRV_VERSION', '0.2.2' );
 define( 'PRV_PLUGIN_FILE', __FILE__ );
 define( 'PRV_PLUGIN_DIR', plugin_dir_path( __FILE__ ) );
 define( 'PRV_PLUGIN_URL', plugin_dir_url( __FILE__ ) );