fix(touch): pointer event parity for slash commands, collab overlay, canvas, and wallet charts
Convert remaining mouse-only event listeners to Pointer Events so touch
and pen inputs work identically to mouse across rApps and canvas:
- rnotes slash-command: mousedown/mouseenter → pointerdown/pointerenter
- collab overlay: mousemove → pointermove for cursor broadcast, click → pointerdown for collab-id tracking
- canvas.html: toolbar label reveal gated behind @media (hover: hover), :active fallbacks on 12 button selectors, JS mouseenter/mouseleave → pointerenter/pointerleave
- wallet-viz D3 charts: all mouseover/mousemove/mouseout → pointerenter/pointermove/pointerleave on transaction paths, balance area, Sankey links, and reset button
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>