Add a deep-linkable, reload-safe route /l/<libId>/<tool> (LibToolPage) that boots
the editor scoped to one backend library; the home page's lib chips become
anchors to it (full nav → clean Emscripten). Local lib FILES stay in-place
(bytes can't be URL-addressed).
Fix empty lib trees against a registry server: fileless/lib-scoped launches use
the placeholder projectId "local", which was sent as x-pcbjam-project — the
closed server then scoped its (0005 mirror) lib resolution to a non-existent
project and returned nothing. Suppress the project header for "local"; real
backend projects keep sending their uuid and keep project-scoped resolution.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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