Loading timing constants, matching the host (LOADING_UX_SPEC §3, the 2026-06-22
design bundle). Exported so authors who hand-roll still match the platform.
Type declaration
ReadonlyfadeMs: 150
The reveal cross-fade duration the host uses.
ReadonlyshimmerMs: 1900
One slow shimmer sweep across a placeholder.
ReadonlyspinThresholdMs: 150
Below this, NO spinner appears — a fast wait never flashes one (§6.2 floor).
Loading timing constants, matching the host (LOADING_UX_SPEC §3, the 2026-06-22 design bundle). Exported so authors who hand-roll still match the platform.