fix: wink is now a real CSS animation, no longer sticks (v0.1.3)

The v0.1.1 wink was rendered as a static SVG (left eye drawn as a
closed curve). Once the 5% random gate picked the wink tone, the
left eye stayed closed until the next page render — if the
dashboard sat idle, Buddy was stuck mid-wink indefinitely. David's
report: "the eye does not unblink."

v0.1.2's lower probability (30% → 5%) reduced how often you'd see
the stuck state, but didn't fix the underlying issue.

This release makes the wink a real transient animation:

- sprite.php no longer swaps the left eye for a closed path when
  tone is wink — both eyes are always open circles in the SVG
- buddy.css adds @keyframes buddyWink that briefly closes the
  left eye (scaleY 0.1) for ~250ms every 2.5s, applied only when
  the parent has the .buddy-sprite--wink class
- right eye keeps its normal 5s blink — the asymmetry is what
  makes it read as a wink rather than a synchronised blink
- mouth/cheeks/label still differ for wink tone (those are valid
  static state changes); only the eye behaviour moved to animation

Net effect: when the 5% chance fires, Buddy now actually winks
(closes, opens, closes, opens) instead of freezing one-eye-shut.

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 Its mood reflects your site's health — published posts feed it, outdated plugins make it sick, clearing spam makes it happy.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:     0.1.2
+ * Version:     0.1.3
  * 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',  '0.1.2' ); }
+if ( ! defined( 'BUDDY_VERSION' ) )  { define( 'BUDDY_VERSION',  '0.1.3' ); }
 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__ ) ); }