release: 3.3.0 → 3.3.1 — drop "WP" prefix, plugin is now just "Logbook"

David's call after a short discussion about WordPress.org marketplace
considerations. WP.org's trademark policy historically discourages
plugins implying official endorsement via a "WP" prefix and has been
known to request rename during submission review. Dropping it now
makes the name cleaner AND sidesteps that future hurdle if/when the
plugin lands on the marketplace.

CHANGES
All user-facing brand mentions: WP Logbook → Logbook across:
- Plugin header (Plugin Name + docblock)
- Admin menu top-level
- Admin sidebar submenu label still "My Log" (already prefix-free)
- Admin bar count menu
- Dashboard widget title
- Settings page H1
- Main page H1
- About page intro card + "What Logbook does" card heading
- Email feedback subject + body intro
- Legacy feedback.php subject lines
- error_log() prefix [WP Logbook] → [Logbook]
- Updater panel description text
- styles.php docblock

VERSION
- wp-notes.php header Version: 3.3.0 → 3.3.1
- WP_NOTES_VERSION constant: 3.3.0 → 3.3.1
- About page version-history card gets new top entry for v3.3.1
  with green "latest" pill; v3.3.0 demoted to previous entry
- CHANGELOG header line tracks the full naming lineage now:
  A-WP-Notes (≤v3.1.0) → WP Logbook (v3.2.0-v3.3.0) → Logbook
  (v3.3.1+)

NOTABLY NOT CHANGED
- Historical CHANGELOG entries for v3.2.0 still say "WP Logbook" —
  that was the correct name at the time, rewriting would be
  revisionist.
- Same zero-migration commitment: internal function names,
  constants, DB option keys, user_meta keys, file paths, plugin
  slug 'wp-notes', and text domain 'a-wp-notes' all unchanged.
- Pure user-facing string change. No data migration, no behaviour
  change. Existing installs see "Logbook" appear on next page
  refresh.

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

inc/wp-notes-feedback.php

@@ -1,6 +1,6 @@
 <?php
 /**
- * Feedback Form for WP Logbook Plugin
+ * Feedback Form for Logbook Plugin
  *
  * This file contains the HTML and AJAX handling for the feedback form.
  */
@@ -95,7 +95,7 @@ function wp_notes_submit_feedback() {
 
     // Example: Send feedback via email
     $to = 'david@icanhelp.ie';
-    $subject = 'WP Logbook Feedback';
+    $subject = 'Logbook Feedback';
     $body = "Name: $name\nEmail: $email\nMessage: $message";
     $headers = array('Content-Type: text/plain; charset=UTF-8');
 
@@ -148,7 +148,7 @@ function wp_notes_submit_help() {
 
     // Example: Send help request via email
     $to = 'david@icanhelp.ie';
-    $subject = 'WP Logbook Help Request';
+    $subject = 'Logbook Help Request';
     $body = "Name: $name\nEmail: $email\nMessage: $message";
     $headers = array('Content-Type: text/plain; charset=UTF-8');