Adds a node-side harness that drives the engine wasm directly, fixtures
that build PDFs in-memory, and cases for font fallback and flattening.
The engine loader now tolerates a runtime without import.meta.resolve so
the suite can load it outside a browser.
Clears the previous document before opening a new one, keeps the
selection when clicking the dock or rotating a box, refreshes the glass
overlay so style changes preview every time, adds double-click word
selection, and widens the Windows font stacks for Indic scripts. The
dock now publishes its own height so the swatches lay out correctly on
small screens.
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