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.

inc/sprite.php

@@ -8,8 +8,10 @@
  * dog / dragon / sprite / etc.
  *
  * Mood tone changes the expression: 'happy' = open smile, 'neutral'
- * = flat mouth, 'sad' = downturned. Eyes blink via CSS keyframes
- * regardless of tone (it's always alive).
+ * = flat mouth, 'sad' = downturned, 'wink' = asymmetric smirk + rosier
+ * cheeks + CSS-driven left-eye wink animation. Eyes blink via CSS
+ * keyframes regardless of tone (it's always alive); the wink keyframe
+ * lives in buddy.css alongside the regular blink.
  */
 
 if ( ! defined( 'ABSPATH' ) ) { exit; }
@@ -45,18 +47,16 @@ function buddy_render_sprite( $species = 'default', $tone = 'happy', $size = 'md
          aria-label="<?php echo esc_attr( sprintf( __( 'Buddy is %s', 'buddy' ), $tone ) ); ?>">
         <!-- body -->
         <circle cx="50" cy="55" r="32" fill="<?php echo esc_attr( $body_fill ); ?>" stroke="#c9941d" stroke-width="2" />
-        <!-- left eye -->
+        <!-- left eye — always an open circle in the SVG. When the
+             tone is 'wink', the buddy-sprite--wink class on the parent
+             triggers a CSS keyframe animation (buddyWink in buddy.css)
+             that briefly closes this eye every couple of seconds.
+             That way the wink is a transient action, not a stuck state. -->
         <g class="buddy-sprite__eye buddy-sprite__eye--left">
-            <?php if ( $tone === 'wink' ) : ?>
-                <!-- Closed left eye for a wink: a downward curved line below the eye-circle's normal y. -->
-                <path d="M 35 46 Q 40 50 45 46"
-                      stroke="#2c3338" stroke-width="2.4" fill="none" stroke-linecap="round" />
-            <?php else : ?>
-                <circle cx="40" cy="46" r="5" fill="#2c3338" />
-                <circle cx="41.2" cy="45" r="1.5" fill="#fff" />
-            <?php endif; ?>
+            <circle cx="40" cy="46" r="5" fill="#2c3338" />
+            <circle cx="41.2" cy="45" r="1.5" fill="#fff" />
         </g>
-        <!-- right eye (always open, even during wink) -->
+        <!-- right eye — always open, normal slow blink even during wink -->
         <g class="buddy-sprite__eye buddy-sprite__eye--right">
             <circle cx="60" cy="46" r="5" fill="#2c3338" />
             <circle cx="61.2" cy="45" r="1.5" fill="#fff" />