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The swing is a real damped harmonic // oscillator (angle'' = -k*angle - c*angle'), integrated with a rAF loop // and written straight to two SVG group refs (clapper rotateZ, bell body // rotateZ at a smaller opposite amplitude for the recoil) — never React // state per frame, matching the hot-path rule. Every new arrival ADDS an // impulse to the oscillator's velocity rather than starting a fresh // animation, so a burst of arrivals reads as one cumulative, increasingly // wild, then settling swing — not N discrete dings layered on top of each // other. The rAF loop itself only runs while the system still has visible // energy (|angle| or |velocity| above a small threshold), so an idle bell // costs nothing. // // The badge increments the instant an arrival's impulse lands (not at a // literal zero-crossing "strike", which would need much more physics to // detect honestly) and gets a one-frame CSS scale squash retriggered via // a forced reflow, so bursts still show a visible pulse per arrival even // though they share one physical swing. // // Hover: pointer position over the bell button drives a small +/-2deg tilt // toward the cursor (direct ref write, no React state). Click opens a // non-modal anchored tray: a hand-rolled focus trap (Tab cycles within it, // Escape closes and returns focus to the trigger, a pointerdown outside // closes it too) rather than the native