Add keyboard play: arrows/WASD/hjkl focus, Enter/Space flips

Focus ring appears on the first key press and hides when the mouse moves.
Enter also triggers Play Again on the win panel.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/card/card.odin

@@ -229,18 +229,17 @@ smoothstep :: proc(t: f32) -> f32 {
     return t * t * (3 - 2 * t)
 }
 
-draw :: proc(card: ^Card, theme: themes.Theme, clickable: bool) {
+draw :: proc(card: ^Card, theme: themes.Theme, clickable: bool, focused := false) {
     eased := smoothstep(card.flip_t)
     squash := abs(math.cos(eased * math.PI)) // 1 → 0 → 1 across the flip
     showing_face := eased >= 0.5
 
     // Cards lift as they turn, and a little on hover
     lift := math.sin(eased * math.PI) * 6
-    hovered := clickable && is_hovered(card)
-    if hovered {
-        lift += HOVER_LIFT
-        ui.set_hovered()
-    }
+    mouse_over := clickable && is_hovered(card)
+    if mouse_over { ui.set_hovered() }
+    hovered := mouse_over || (clickable && focused)
+    if hovered { lift += HOVER_LIFT }
 
     scale: f32 = 1
     if card.pulse_t > 0 {
@@ -273,6 +272,11 @@ draw :: proc(card: ^Card, theme: themes.Theme, clickable: bool) {
     dest := raylib.Rectangle{center.x, center.y, width * squash, height}
     raylib.DrawTexturePro(texture, source, dest, {dest.width / 2, dest.height / 2}, 0, tint)
 
+    if focused {
+        ring := raylib.Rectangle{center.x - width * squash / 2 - 6, center.y - height / 2 - 6, width * squash + 12, height + 12}
+        raylib.DrawRectangleRoundedLinesEx(ring, ROUNDNESS, SEGMENTS, 3, raylib.Fade(theme.ink, 0.75))
+    }
+
     if card.matched && card.flip_t == 1 {
         outline := raylib.Rectangle{center.x - width / 2 - 3, center.y - height / 2 - 3, width + 6, height + 6}
         raylib.DrawRectangleRoundedLinesEx(outline, ROUNDNESS, SEGMENTS, 3, theme.accent)