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.

assets/css/buddy.css

@@ -24,6 +24,17 @@
     animation-duration: 7s; /* sadder Buddy blinks slower */
 }
 
+/* Cheeky wink: when the mood-label picks the 'wink' tone, the LEFT eye
+   runs a faster, more dramatic keyframe that closes for ~250ms every
+   2.5s. The right eye keeps its normal 5s blink — that asymmetry is
+   what makes it read as a wink rather than a synchronised blink.
+   v0.1.3 fix: previously the wink was a static SVG render (left eye
+   drawn as a closed curve), which got stuck on the page until the next
+   render. Now it's a real transient animation, so Buddy unblinks. */
+.buddy-sprite--wink .buddy-sprite__eye--left {
+    animation: buddyWink 2.5s infinite;
+}
+
 @keyframes buddyBob {
     0%, 100% { transform: translateY(0); }
     50%      { transform: translateY(-4px); }
@@ -32,6 +43,10 @@
     0%, 92%, 100% { transform: scaleY(1); }
     94%, 98%      { transform: scaleY(0.1); }
 }
+@keyframes buddyWink {
+    0%, 80%, 100% { transform: scaleY(1); }      /* eye open most of the cycle */
+    85%, 95%      { transform: scaleY(0.1); }    /* closes briefly = the wink */
+}
 
 /* ── Dashboard widget ───────────────────────────────────────────── */