v1.2.7: Phase 0 — CSS foundation + icons + snackbar
style.css: +93 lines — sidebar, view, tabs, toolbar, field (label on top),
skeleton, snackbar, combobox classes. Font scale 13/14/16.
icons.js (NEW): 10 inline-SVG Lucide icons (play, edit, trash, check, x,
chevronDown, search, plus, rotateCw, cloud). stroke=currentColor.
snackbar.js (NEW): showSnackbar(msg, type). bottom-right, 4s/8s auto-hide,
stacking max 4, accessibility role=status aria-live=polite.
index.html: include icons.js before utils.js
naeel
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