Redesign the default skin in a phantom poster style

[nulltask]

Summary

Repaints the default (skinless) skin family — gameplay, song select, and result — in a red / black / white poster style: slanted plates, jagged starbursts, halftone fields, and condensed italic type. Geometry contracts are unchanged (LR2 default 7-keys lane positions, 640x480 design canvas, select hit areas).

• Gameplay: new header, gauge, song plate, score plate with a rank badge, judge tally, and an idle BGA screen. The playfield stays plain and IIDX-like (flat white / blue / red notes, simple hit flash), with smooth gradient key beams.
• Tabular figures: Canvas 2D has no font-feature-settings, so live numerals are laid out per glyph in fixed-width cells to keep changing values from jittering.
• Song select: ambient motion (drifting halftone, BPM-synced starburst, speed streaks, scrolling kicker, beat-kicking pointer, card glint), a staggered list fly-in, and a slide-in on every cursor move. PLAY is now the primary action.
• Result: an entrance timeline (slash sweep, verdict slam, staggered plates, counter roll-up, growing bars, graphs drawing in, rank stamp) plus ambient loops; a skip jumps to the settled layout.
• Type stack: Anton (Latin display), Dela Gothic One (titles), M PLUS 1p (UI / Japanese), with LINE Seed JP as the fallback. The demo loads them via Google Fonts.
• Demo: help button moved to the bottom center.
• Docs: AGENTS.md gains Conventional Branch naming rules.

Testing

• vp check: 0 errors
• vp test run packages/player-web: all passing, including new tests for the pure shape / layout / easing helpers in scene/default/phantom-style.ts
• Verified gameplay, select, and result visually in the demo with autoplay

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Status	Name	Latest Commit	Preview URL	Updated (UTC)
✅ Deployment successful! View logs	be-music-player-demo	7ef5477	Commit Preview URL Branch Preview URL	Sep 28 2026, 05:12 AM

[github-actions]

Exports Benchmark

• Base SHA: 196afa12bf24
• Head SHA: 7ef547773494
• Comparable cases: 83
• Regression threshold: 8.00%
• Overall verdict uses the median change across cases.
• Per-case lists compare median ops/s, not mean.
• Base runs: median of 3
• Head runs: median of 3

Summary

Metric	Value
Overall	unchanged
Median change	+0.00%
Mean change	+0.31%
Cases improved (>= threshold)	1
Cases regressed (<= -threshold)	1
Cases unchanged	81
Cases excluded (sub-timer-resolution)	160
Head benchmarked cases	243
Head skipped cases	21

Top Regressions

API	Base median ops/s	Head median ops/s	Change
audio-renderer.writeAudioFile	1874.58	1661.27	-11.38%

Top Improvements

API	Base median ops/s	Head median ops/s	Change
player-web.buildAudioBus	461254.61	615763.55	+33.50%

Excluded (sub-timer-resolution)

Per-call latency at or below 0.001ms on at least one side — the reported time is measurement noise, not the case's real cost, so no percent change is shown.

API	Base median ops/s	Head median ops/s
audio-renderer.createTimingBuildContext	1923076.93	1923076.93
chart.compareEvents	10416666.69	10416666.69
chart.createBeatResolver	20833332.60	20833332.60
chart.eventToBeat	13888889.10	13888889.10
chart.exWavVolumeCentibelsToLinearGain	15625000.04	15625000.04
chart.getMeasureBeats	20833332.60	20833332.60
chart.isBmsBgmVolumeChangeChannel	17857142.61	17857142.61
chart.isBmsDynamicVolumeChangeChannel	17857142.61	17857142.61
chart.isBmsKeyVolumeChangeChannel	17857142.61	17857142.61
chart.isBmsLongNoteChannel	20833332.60	20833332.60
chart.isLandmineChannel	20833332.60	20833332.60
chart.isPlayableChannel	20833332.60	20833332.60