swipelab 0b293a2c48 P11.2: escalating combo emphasis tied to cascade depth (sx / iOS) ...

Scale the combo FX with cascade depth (mv.rounds.len) — the same depth the
cascade SFX (play_cascade) steps up on — so deeper cascades read as more
exciting and land in lockstep with the audio escalation. Purely visual and
self-pruning: no board / score / move state changes, and input stays gated by
BoardAnim.active alone.

- board_fx.sx: add fx_combo_level (mirrors audio's cascade_cue_index clamp:
  depth<=1 -> floor, depth>=5 -> ceiling). The +points popup now carries the
  cascade depth and grows one font step + lerps gold -> hot-gold per level
  (fx_popup_font / fx_popup_color). Every burst of a deep cascade gets a
  whole-move depth boost (FX_BURST_DEPTH) on top of the existing per-round bump.
- board_view.sx: render_fx_popups derives styling from depth and tops a combo
  with a "COMBO xN" label naming the true cascade depth.
- tests/fx_combo.sx: headless snapshot locking the depth->level/font table and
  asserting fx_combo_level matches the cascade-cue index column entry-for-entry.
- goldens/p11_combo_deep.png + README: deterministic depth-5 capture (M3TE_FX=11)
  vs the depth-1 single clear (M3TE_FX=3); FX gone after settle at a later phase.

2026-06-05 20:51:56 +03:00

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