serverDiagnostics

Editor extension that renders LSP diagnostics pushed by the language server.

Mirrors upstream @codemirror/lsp-client's serverDiagnostics(). It installs :lint's diagnostic-display extension (lintDisplay) — the underline decorations, hover tooltip, lint panel and keymap — but no local lint source, because the diagnostics arrive from the server via LSPClient.languageClient's textDocument/publishDiagnostics handler rather than from a local linter. Folded into languageServerSupport.