ux: replace generic cog admin-menu icon with closed-book (v3.3.5)

The WordPress admin sidebar showed "Logbook" with the generic
cog wheel icon (dashicons-admin-generic) — fine for a settings
page, off-brand for a plugin whose entire identity is "logbook".

Swapped to dashicons-book-alt (closed book) — the most literal
possible match in the Dashicons set, and visually reinforces the
brand at the first place users see the plugin every day.

Alternatives also viable (commented in the changelog for future
reference): dashicons-edit (pencil), dashicons-clipboard,
dashicons-welcome-write-blog, dashicons-format-aside.

VERSION
- wp-notes.php header 3.3.4 → 3.3.5
- WP_NOTES_VERSION constant 3.3.4 → 3.3.5
- About page version-history leads with v3.3.5; v3.3.4 demoted.

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

wp-notes.php

@@ -5,7 +5,7 @@
  * Plugin Name: Logbook
  * Plugin URI: https://icanhelp.ie/wp-notes
  * Description: A lightweight task & logbook plugin for WordPress. Log your daily work, mark tasks done, and keep a tidy record inside the dashboard. Perfect for freelancers showing clients what's been delivered and students proving work to teachers.
- * Version: 3.3.4
+ * Version: 3.3.5
  * Requires at least: 5.0
  * Requires PHP: 7.2
  * Author: IR240474
@@ -33,7 +33,7 @@ if (!isset($wp_notes_init)) {
     $wp_notes_init = true;
     
     // Plugin Constants
-    if (!defined('WP_NOTES_VERSION')) define('WP_NOTES_VERSION', '3.3.4');
+    if (!defined('WP_NOTES_VERSION')) define('WP_NOTES_VERSION', '3.3.5');
     if (!defined('WP_NOTES_FILE')) define('WP_NOTES_FILE', __FILE__);
     if (!defined('WP_NOTES_PATH')) define('WP_NOTES_PATH', plugin_dir_path(__FILE__));
     if (!defined('WP_NOTES_URL')) define('WP_NOTES_URL', plugin_dir_url(__FILE__));
@@ -174,7 +174,7 @@ function wp_notes_admin_menu() {
         'manage_options',
         'wp-notes',
         'wp_notes_page_callback',
-        'dashicons-admin-generic',
+        'dashicons-book-alt',        // closed book — reinforces the "logbook" identity
         3
     );