fix: update checker — fall back to /tags when no formal Gitea Release exists (v3.3.2)

The v3.3.0 update checker only queried Gitea's /releases/latest
endpoint, which requires a formal Release object (created via the
Gitea web UI with optional notes + zip assets attached). A plain
"git tag v3.3.x && git push --tags" from the terminal does NOT
create that Release object — so the checker kept returning "No
releases tagged on the Gitea repo yet" even when tags existed.

wp_notes_fetch_latest_release() now falls back to the
/tags?limit=1 endpoint when /releases/latest returns 404 (or any
non-200). It synthesises a release-like payload from the newest
tag — tag_name, html_url pointing at the tag view, tag message as
the body, empty assets[] so the existing download-URL logic falls
through to Gitea's source-archive URL pattern (/archive/<tag>.zip).

Net effect: the "Check now" button now finds the latest version
whether David creates formal Gitea Releases OR just pushes tags
with "git push --tags". No workflow change required.

Discovered while diagnosing why "Check now" wasn't seeing today's
v3.1.0/v3.2.0/v3.3.0/v3.3.1 tags (just pushed in this session)
— the tags were there, the formal Release objects were not.

KNOWN LIMITATION (not a bug — flagged)
The Gitea repo ranger/a-wp-notes-v3 is currently private. Anonymous
API requests get a 404 (Gitea's standard behaviour for private
repos). The updater code is correct but can't actually reach the
API on a private repo without authentication. Fix: change the
repo visibility to public on Gitea — appropriate anyway for a
GPL-licensed plugin headed for the WordPress.org marketplace.

VERSION BUMP
- wp-notes.php header 3.3.1 → 3.3.2
- WP_NOTES_VERSION constant 3.3.1 → 3.3.2
- About page version-history leads with v3.3.2; v3.3.1 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: 3.3.1
+ * Version: 3.3.2
  * 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', '3.3.1');
+    if (!defined('WP_NOTES_VERSION')) define('WP_NOTES_VERSION', '3.3.2');
     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__));