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ONE governing scalar, // `cutFrac = elapsedDays / periodDays`, drives everything on the old strip — // the shear x-position, the dimmed "offcut" (used) width, the bright // "remnant" (unused) width, and `creditRaw = (1 - cutFrac) * oldPrice` — the // same expression that sizes the remnant rect also prints as the credit, // never a second computation. A strip's bar HEIGHT maps to its plan's daily // rate, so rect area (width-in-days * height-in-rate) literally IS money; // that identity is the same on every row, so it survives the reflow. // // Choosing a candidate plan re-measures that credit against the new plan's // daily rate: creditedDays = creditedAmount / newDailyRate, and the remnant // animates from its old-strip position/size to that new width and the new // plan's own bar height, across one 600ms ease-out-expo progress value `t`. // Both endpoints already satisfy width*height === creditedAmount * K (K = // px-per-day * px-per-rate, one constant shared by both rows), so deriving // width(t) by lerp and height(t) = creditedAmount*K / width(t) keeps the // rectangle's area exactly constant on every intermediate frame too — area // preservation isn't checked after the fact, it's structurally impossible // for the rect to have any other area at any t. // // Whatever the raw credit loses to the provider's rounding unit (floored to // the nearest cent by default) is never silently absorbed: it renders as its // own thin labelled sliver — the kerf — sitting right at the cut, between // the offcut and the remnant. offcut + kerf + remnant always reconstruct the // full old strip exactly; credit + charge, rounded to the cent a bill shows, // never quite sum back to the strip's full price, and the kerf sliver is // where the missing fraction visibly lives instead of vanishing. // // The cut itself is a fixed hash-seeded (mulberry32) 2px polyline, same seed // every render regardless of props — a perfectly straight line reads as a // CSS border, a wavered one reads as a blade having actually passed through. // // A11Y: the cloth (both SVG strips) is aria-hidden — decoration only, never // the source of truth. The real controls are native per // candidate plan (grouped in a

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