feat(effects): polish 8 effects and add 7 new engines with parallax

Synthwave, fireflies, snow, sakura, nebula: CSS/SVG. Matrix and
constellation: canvas. Existing engines gain depth, color, glow, and
parallax (mouse and device tilt, opt-in on iOS)

public/i18n/en.json

@@ -116,6 +116,9 @@
     "WIDE_LAYOUT_HINT": "Uses more of a wide screen.",
     "REDUCE_MOTION": "Reduce animations",
     "REDUCE_MOTION_HINT": "Shop effects and confetti stand still, also on other profiles.",
+    "TILT": "Tilt effects",
+    "TILT_HINT": "Backgrounds follow when you tilt your phone. Your phone asks for permission.",
+    "TILT_DENIED": "Permission was refused. Allow motion access in Safari, then try again.",
     "BACKGROUND": "Background",
     "BACKGROUND_HINT": "Open a game in your library and choose \"Use as background\".",
     "BACKGROUND_REMOVE": "Remove background",
@@ -1049,6 +1052,20 @@
       "BN_WAVES": "Animated banner: waves",
       "BG_BOKEH": "Animated background: bokeh",
       "BN_BOKEH": "Animated banner: bokeh",
+      "BG_SYNTHWAVE": "Animated background: synthwave sunset",
+      "BN_SYNTHWAVE": "Animated banner: synthwave sunset",
+      "BG_FIREFLIES": "Animated background: fireflies",
+      "BN_FIREFLIES": "Animated banner: fireflies",
+      "BG_SNOW": "Animated background: snow",
+      "BN_SNOW": "Animated banner: snow",
+      "BG_SAKURA": "Animated background: cherry blossoms",
+      "BN_SAKURA": "Animated banner: cherry blossoms",
+      "BG_NEBULA": "Animated background: nebula",
+      "BN_NEBULA": "Animated banner: nebula",
+      "BG_MATRIX": "Animated background: matrix rain",
+      "BN_MATRIX": "Animated banner: matrix rain",
+      "BG_CONSTELLATION": "Animated background: constellation",
+      "BN_CONSTELLATION": "Animated banner: constellation",
       "BADGE_FINISH_10": "Finisher badge",
       "BORDER_FINISH_25": "Silver avatar border",
       "FRAME_FINISH_50": "Emerald banner frame",