fix(badges): perceptually uniform rainbow via OKLCH + @property

Replaces filter:hue-rotate() with CSS @property --ph-hue/--ph-lit animated
as numbers, applied as oklch() colors on SVG rect/line children. OKLCH keeps
perceptual lightness constant across hue rotation — no more brown/dark-blue
variance between slots. Pulse mode animates --ph-lit 0.42→0.78 for breathing.
Adds slow_pulse cfg_json flag + form checkbox. @property inherits:true lets
the animated value cascade from the div to its SVG children without per-child
animation declarations.

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

src/routes/events/[event_id]/(badges)/badges/[badge_id]/ae_comp__badge_obj_view.svelte

@@ -1419,24 +1419,58 @@ const code_to_icon: {
  * active they form a proper tri-phase RGB cycle. Two active slots are 120° apart.
  * Negative animation-delay starts each slot mid-cycle at its designated phase.
  */
-/* Cycle mode (default): fast linear hue rotation, 120° phase apart per slot */
+/*
-@keyframes ae_punch_hole_rainbow {
+ * Perceptually uniform punch-hole rainbow via OKLCH + @property.
-    from { filter: hue-rotate(0deg); }
+ *
-    to   { filter: hue-rotate(360deg); }
+ * WHY NOT hue-rotate(): CSS filter hue-rotate() works in RGB space — perceptual
+ * brightness varies across hues (yellow ≫ blue), so slots at different phases look
+ * noticeably lighter or darker than each other.
+ *
+ * FIX: @property lets the browser interpolate --ph-hue as a number. Applying colors
+ * as oklch(L C H) rotates hue at CONSTANT perceptual lightness — all three slots
+ * stay visually equally bright regardless of phase position.
+ *
+ * inherits: true — the animated value cascades to SVG children (rect, line) so
+ * each child reads the parent div's current --ph-hue without its own animation.
+ */
+@property --ph-hue {
+    syntax: '<number>';
+    inherits: true;
+    initial-value: 0;
+}
+@property --ph-lit {
+    syntax: '<number>';
+    inherits: true;
+    initial-value: 0.65;
 }
-.punch_hole_rainbow_left   { animation: ae_punch_hole_rainbow 2.5s  0.000s linear     infinite; }
-.punch_hole_rainbow_right  { animation: ae_punch_hole_rainbow 2.5s -0.833s linear     infinite; }
-.punch_hole_rainbow_center { animation: ae_punch_hole_rainbow 2.5s -1.667s linear     infinite; }
 
-/* Pulse mode: slow breathing — dim→bright while hue shifts 180° and back.
+/* Cycle: hue rotates, lightness stays at 0.65 */
-   Same 120° phase offsets (6s ÷ 3 = 2s per slot) so they breathe in turn. */
+@keyframes ae_ph_cycle { from { --ph-hue: 0; } to { --ph-hue: 360; } }
-@keyframes ae_punch_hole_pulse {
+
-    0%, 100% { filter: hue-rotate(0deg)   brightness(0.55); }
+/* Pulse: hue shifts 180° while lightness breathes 0.42 → 0.78 → 0.42 */
-    50%      { filter: hue-rotate(180deg) brightness(1.30); }
+@keyframes ae_ph_pulse {
+    0%, 100% { --ph-hue: 0;   --ph-lit: 0.42; }
+    50%      { --ph-hue: 180; --ph-lit: 0.78; }
+}
+
+/* 120° phase offsets: 2.5s ÷ 3 ≈ 0.833s | 6s ÷ 3 = 2s */
+.punch_hole_rainbow_left   { animation: ae_ph_cycle 2.5s  0.000s linear     infinite; }
+.punch_hole_rainbow_right  { animation: ae_ph_cycle 2.5s -0.833s linear     infinite; }
+.punch_hole_rainbow_center { animation: ae_ph_cycle 2.5s -1.667s linear     infinite; }
+.punch_hole_pulse_left     { animation: ae_ph_pulse 6s   0.000s ease-in-out infinite; }
+.punch_hole_pulse_right    { animation: ae_ph_pulse 6s  -2.000s ease-in-out infinite; }
+.punch_hole_pulse_center   { animation: ae_ph_pulse 6s  -4.000s ease-in-out infinite; }
+
+/* CSS overrides the static inline SVG fill/stroke attributes for animated markers. */
+.punch_hole_rainbow_left   rect, .punch_hole_rainbow_right   rect, .punch_hole_rainbow_center   rect,
+.punch_hole_pulse_left     rect, .punch_hole_pulse_right     rect, .punch_hole_pulse_center     rect {
+    fill:   oklch(var(--ph-lit) 0.20 var(--ph-hue) / 0.40);
+    stroke: oklch(var(--ph-lit) 0.25 var(--ph-hue));
+}
+.punch_hole_rainbow_left   line, .punch_hole_rainbow_right   line, .punch_hole_rainbow_center   line,
+.punch_hole_pulse_left     line, .punch_hole_pulse_right     line, .punch_hole_pulse_center     line {
+    stroke: oklch(var(--ph-lit) 0.25 var(--ph-hue));
 }
-.punch_hole_pulse_left   { animation: ae_punch_hole_pulse 6s  0.000s ease-in-out infinite; }
-.punch_hole_pulse_right  { animation: ae_punch_hole_pulse 6s -2.000s ease-in-out infinite; }
-.punch_hole_pulse_center { animation: ae_punch_hole_pulse 6s -4.000s ease-in-out infinite; }
 
 .punch_hole_print_rgb { display: none; }
 @media print {