style(sw): calmer viewer header switches without the yellow face
User-approved 2026-10-22 design for the SW viewer header switches (2.5D,
어두운 배경); panel switches and the --hm-sw-viewer-accent token unchanged.
- OFF: track #020a07, knob #5f7a71 (dim gray-green).
- ON: track var(--hm-sw-viewer-hover) #266651, knob var(--hm-sw-viewer-muted)
#bddfd4. No yellow face or ring.
- New tokens --hm-sw-viewer-switch-thumb-off / -on / --hm-sw-viewer-switch-on;
size, knob travel, bevel and the 60% disabled opacity unchanged.
- DESIGN_RULES.md header switch token row updated.
shkim4
449398e3de