feat: add winking expression (v0.1.1)

Buddy now has a fourth mood tone — wink — with one eye closed, an
asymmetric smirk, and rosier cheeks. Renders as a small variant
inside the existing inline-SVG sprite (still zero image files, no
new assets). When overall mood is >= 75, there's a 30% chance on
each page render that the wink replaces the standard happy face —
gives the pet a touch of unpredictable personality.

Why this commit exists: v0.1.0 had three tones (happy / neutral /
sad). Adding wink is the smallest possible demo that the SVG
expression engine is properly extensible — every future mood,
state, accessory or species can land via the same pattern. ~20
lines of PHP, ~2 lines of CSS, no bundle weight, no dependencies.

CHANGES
- inc/sprite.php: wink added to allowed-tones list. Left eye
  renders as a closed-eye arc instead of the open circle. Mouth
  shifts to an asymmetric smirk. Cheek opacity 0.55 → 0.75 for
  extra cheekiness.
- inc/state.php: buddy_mood_label() returns wink ~30% of the time
  when mood >= 75.
- assets/css/buddy.css: new .buddy-widget__mood--wink and
  .buddy-main__mood--wink rules — warm amber pill.
- About-page version-history leads with v0.1.1; v0.1.0 demoted.

VERSION
- buddy.php header 0.1.0 → 0.1.1
- BUDDY_VERSION constant 0.1.0 → 0.1.1

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

buddy.php

@@ -5,7 +5,7 @@
  * Plugin Name: Buddy
  * Plugin URI:  https://icanhelp.ie/buddy
  * Description: Adopt a small companion that lives in your WordPress dashboard. Its mood reflects your site's health — published posts feed it, outdated plugins make it sick, clearing spam makes it happy. Gamifies WordPress maintenance with a bit of charm.
- * Version:     0.1.0
+ * Version:     0.1.1
  * Requires at least: 5.0
  * Requires PHP: 7.4
  * Author:      David Keane
@@ -20,7 +20,7 @@
 if ( ! defined( 'ABSPATH' ) ) { exit; }
 
 // Plugin coordinates.
-if ( ! defined( 'BUDDY_VERSION' ) )  { define( 'BUDDY_VERSION',  '0.1.0' ); }
+if ( ! defined( 'BUDDY_VERSION' ) )  { define( 'BUDDY_VERSION',  '0.1.1' ); }
 if ( ! defined( 'BUDDY_FILE' ) )     { define( 'BUDDY_FILE',     __FILE__ ); }
 if ( ! defined( 'BUDDY_PATH' ) )     { define( 'BUDDY_PATH',     plugin_dir_path( __FILE__ ) ); }
 if ( ! defined( 'BUDDY_URL' ) )      { define( 'BUDDY_URL',      plugin_dir_url( __FILE__ ) ); }