The keyboard focus ring rendered as a static yellow outline. A new
pulse_focus_overlay system modulates the overlay's BorderColor alpha
with a sin curve over MOTION_FOCUS_PULSE_SECS (1.4 s), breathing the
visible alpha between 0.65× and 1.0× of FOCUS_RING's native value.
The motion is slow enough to read as a calm heartbeat in peripheral
vision rather than a competing animation, and a focus change still
draws the eye because the ring re-attaches at full brightness on
the next pulse cycle.
The pulse honours AnimSpeed::Instant by reading SettingsResource
and skipping the modulation entirely (static FOCUS_RING colour) for
reduced-motion users — matches the convention used elsewhere for
animation gating.
A pure focus_ring_pulse_factor(elapsed_secs) helper is unit-tested
for the curve shape: 0.825 at t=0 (mid-point), 1.0 at the
quarter-period peak, 0.65 at the three-quarter-period trough, and a
sweep across two full periods stays within the [0.65, 1.0] range.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
funman300
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