Rework HomePage into KiCad-launcher-style zones: local file-load, a Tools grid,
backend projects, and a backend libraries listing (useLibs over the shared
listLibs). The Tools grid shows all seven tools in KiCad's standalone order
(Schematic/Symbol/PCB/Footprint editors, Gerber Viewer, Calculator, Drawing
Sheet); clicking a tool or a library launches the editor with no project
(launchedTool → WasmTool slug=local) — file-less editors browse backend libs,
document editors open blank. Harden the web e2e global-setup to assert the
self-provisioned origin libs (Device, Resistor_SMD) are present, failing fast.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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