Plugins read problems from a host-owned snapshot that records every Diagnostics event per file and producer, instead of the UI-reported Problems reports, so what a plugin sees no longer depends on window lifetime or the invoking window. Adds the problems-changed workbench event (plugin API 1.8.0, gated at needs_api 8), editor focus events for files of other windows, severity style previews in plugin settings, and lays plugin annotations on the line-end chain before code-vision hints and inline blame. Components and fixtures are rebuilt for API 1.8.0.
Co-authored-by: muutot <92625353+muutot@users.noreply.github.com>