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-updater.php

@@ -1,6 +1,6 @@
 <?php
 /**
- * WP Logbook — self-hosted update checker against the Gitea repo.
+ * Logbook — self-hosted update checker against the Gitea repo.
  *
  * Polls the Gitea Releases API for the latest tagged release and
  * compares its tag (e.g. "v3.3.0") against WP_NOTES_VERSION.
@@ -180,7 +180,7 @@ function wp_notes_render_updates_panel() {
     <div class="wp-notes-updates" style="max-width:720px; margin-top:24px; padding:18px 20px; background:#fff; border:1px solid #ccd0d4; border-radius:4px;">
         <h2 style="margin-top:0;">Updates</h2>
         <p style="margin:0 0 12px;">
-            WP Logbook is self-hosted on Gitea. Click <strong>Check now</strong> to ask the repo whether there's a newer release than the one you're running.
+            Logbook is self-hosted on Gitea. Click <strong>Check now</strong> to ask the repo whether there's a newer release than the one you're running.
         </p>
 
         <p id="wp-notes-update-status" style="margin:0 0 12px;">