Vary glitch band positions across loop cycles; soften corner ticks

GLITCH_STATES was a fixed list of 4 band configs that every repeat cycle
played identically, so the jitter looked the same each time it looped.
Expanded to an 8-entry GLITCH_STATE_POOL and rotate through a different
4-state window each cycle (wrapping back to the start via modular
indexing, since Starlark list slicing doesn't wrap) -- verified via an
isolated two-cycle test that cycle 2's band positions genuinely differ
from cycle 1's, not just coincidentally similar-looking.

Also added alpha transparency to the corner tick color (#33ff9980) so
they read as a subtle HUD accent rather than a solid opaque overlay.

subwave_nowplaying.star

@@ -357,12 +357,25 @@ def _zoomed_art(art_bytes, zoom_scale, zoom_position, subsonic_id):
 # middle band, each about 30% of the frame's height.
 GLITCH_HOLD_TICKS = 5  # ~250ms per jitter state at the default 50ms/tick
 GLITCH_PAUSE_TICKS = 15  # ~750ms of clean art between bursts
-GLITCH_STATES = [
-    # (top1, height1, shift1, hue1, top2, height2, shift2, hue2)
+GLITCH_STATES_PER_CYCLE = 4
+
+# A larger pool than any one burst needs, so repeated cycles (see
+# GLITCH_REPEATS below) draw a different rotating window of states each
+# time instead of showing the identical 4 band positions every loop.
+# (top1, height1, shift1, hue1, top2, height2, shift2, hue2); proportions
+# loosely modeled on the one SUB/WAVE keyframe that was visible (roughly
+# the top third and an overlapping middle band, each ~30% of the frame's
+# height) -- see the note above GLITCH_HOLD_TICKS for why that's the only
+# part grounded in anything observed rather than invented.
+GLITCH_STATE_POOL = [
     (3, 9, -2, 150.0, 19, 8, 2, -60.0),
     (2, 8, 2, 150.0, 20, 9, -3, -60.0),
     (5, 7, -3, 150.0, 17, 10, 1, -60.0),
     (1, 10, 1, 150.0, 21, 7, -2, -60.0),
+    (6, 6, 1, 150.0, 14, 9, 3, -60.0),
+    (0, 8, 3, 150.0, 24, 6, -1, -60.0),
+    (4, 7, -1, 150.0, 12, 10, 2, -60.0),
+    (2, 9, -3, 150.0, 22, 7, 1, -60.0),
 ]
 
 # render.Sequence doesn't loop on its own (see _glitch_scanlines below), so
@@ -371,10 +384,18 @@ GLITCH_STATES = [
 # rather than relying on any runtime looping. Rounds up so the window is
 # always fully covered, even if that runs a little past
 # STATIC_OVERLAY_SECONDS -- better than the jitter cutting out early.
-_GLITCH_CYCLE_TICKS = len(GLITCH_STATES) * GLITCH_HOLD_TICKS + GLITCH_PAUSE_TICKS
+_GLITCH_CYCLE_TICKS = GLITCH_STATES_PER_CYCLE * GLITCH_HOLD_TICKS + GLITCH_PAUSE_TICKS
 _GLITCH_TICKS_PER_SECOND = 20  # 1000ms / 50ms-per-tick
 GLITCH_REPEATS = int(STATIC_OVERLAY_SECONDS * _GLITCH_TICKS_PER_SECOND / _GLITCH_CYCLE_TICKS) + 1
 
+def _glitch_states_for_cycle(cycle_index):
+    # Rotate through GLITCH_STATE_POOL instead of slicing (which doesn't
+    # wrap around in Starlark), so each cycle's window of states can
+    # straddle the end of the pool and loop back to the start.
+    pool_size = len(GLITCH_STATE_POOL)
+    start = (cycle_index * GLITCH_STATES_PER_CYCLE) % pool_size
+    return [GLITCH_STATE_POOL[(start + i) % pool_size] for i in range(GLITCH_STATES_PER_CYCLE)]
+
 def _glitch_band(zoomed_art, top, height, shift_x, hue_change):
     tinted = filter.Hue(child = zoomed_art, change = hue_change)
     band = render.Padding(
@@ -410,8 +431,8 @@ def _glitch_jitter(zoomed_art):
     pause = _glitch_hold(render.Box(width = ART_SLOT, height = ART_SLOT), GLITCH_PAUSE_TICKS)
 
     sequence = []
-    for _ in range(GLITCH_REPEATS):
-        for top1, h1, shift1, hue1, top2, h2, shift2, hue2 in GLITCH_STATES:
+    for cycle_index in range(GLITCH_REPEATS):
+        for top1, h1, shift1, hue1, top2, h2, shift2, hue2 in _glitch_states_for_cycle(cycle_index):
             state = render.Stack(children = [
                 _glitch_band(zoomed_art, top1, h1, shift1, hue1),
                 _glitch_band(zoomed_art, top2, h2, shift2, hue2),
@@ -486,7 +507,7 @@ def _glitch_effect(zoomed_art):
         child = render.Stack(children = [
             _glitch_jitter(zoomed_art),
             _glitch_scanlines(),
-            _glitch_corner_ticks("#33ff99"),
+            _glitch_corner_ticks("#33ff9980"),
         ]),
     )