Armed-only snap guide — gold edge line appears only when snap is within range
Wires the live snap guide so users can see when a snap is armed. The gold guide line appears only when findSnap returns non-null (within 15px of an adjacent edge) and vanishes the instant you're out of range. setSnapGuide is change-gated — no setState on every pointer-move.
v101.0.32026-06-01
·FloatingTile onMove: armed-only findSnap + change-gated setSnapGuide (string key; fires only on null→armed, armed→null, or coord change)
·onUp: setSnapGuide(null) clears guide on release, cancel, and escape
·SnapGuide type slimmed to {edgeX, edgeY} — previewX/Y/W/H removed
·SnapGuideOverlay: preview-rectangle div removed, un-gated (was {false &&})
·BREAK_TOL reduced from 45px to 30px (SNAP_TOL * 2)
·Guide line CSS: var(--lw-accent, #FFB347) Solar Plasma gold with subtle glow