Restore JSDoc namespace declarations

[ahejlsberg]

This PR completes work that was started by @jakebailey. Specifically, it simplifies a few functions and adds proper remapping of reparsed nodes such that Quick Info, Find-all-refs, Rename, etc. on namespaced JSDoc names work in the language service.

Fixes #3842.

[Copilot]

Pull request overview

Completes restoration of JSDoc dotted-name (NS.T) @typedef and @callback support. The parser now produces a JSDocFullName (Identifier | nested ModuleDeclaration) for the names of @typedef/@callback, and the reparser wraps the resulting type alias in a chain of (exported) namespace declarations so that names like NS.MyCallback resolve and participate in declaration emit, find-all-refs, rename, etc.

Changes:

• New parseJSDocTypeNameWithNamespace produces a nested ModuleDeclaration chain for dotted @typedef/@callback names; JSDocCallbackTag.FullName is renamed to name and typed as JSDocFullName.
• Reparser wraps reparsed type aliases in synthetic namespace ModuleDeclarations (wrapInJSDocNamespace), with inner namespaces explicitly exported and the outer one relying on IsImplicitlyExportedJSDocDeclaration (renamed from IsImplicitlyExportedJSTypeAlias) for module visibility.
• EmitResolver.determineIfDeclarationIsVisible now handles KindExportSpecifier (re-export without module specifier) as visible; someSymbolTableInScope looks up reparsed nodes; declareSourceFileMember narrows from IsExternalOrCommonJSModule to IsExternalModule; CHANGES.md drops the JSDoc-namespace limitation; many submodule baselines updated.

Reviewed changes

Copilot reviewed 55 out of 58 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
internal/parser/jsdoc.go	Parse JSDoc dotted name into nested ModuleDeclaration.
internal/parser/reparser.go	Wrap reparsed type alias in namespace chain; export-modifier helper.
internal/ast/utilities.go	Rename helper to IsImplicitlyExportedJSDocDeclaration, include reparsed ModuleDeclaration.
internal/ast/nodeflags.go	Add NodeFlagsIdentifierIsInJSDocNamespace, NodeFlagsNestedNamespace.
internal/ast/ast.go	TypeExpression() now handles JSDocCallbackTag.
internal/ast/ast_generated.go	JSDocCallbackTag.FullName → private name *JSDocFullName; JSDocTypedefTag.name retyped.
internal/binder/binder.go	Use renamed helper; declareSourceFileMember uses IsExternalModule.
internal/checker/symbolaccessibility.go	Resolve via GetReparsedNodeForNode in scope traversal.
internal/checker/emitresolver.go	Treat ExportSpecifier re-exports as visible; use new helper.
internal/transformers/declarations/transform.go	Use renamed helper for export modifier.
internal/ls/importTracker.go	Use renamed helper.
internal/api/encoder/*	Regenerated for renamed field.
_packages/native-preview/src/...	Regenerated TS bindings for JSDocFullName/renamed field.
_scripts/ast.json	AST schema updates.
CHANGES.md	Remove JSDoc-namespace limitation note.
testdata/tests/cases/compiler/jsDocTypedefTagNamespace.ts	New compiler test.
testdata/baselines/reference/...	Updated baselines / removed obsolete diffs.
testdata/submoduleAccepted.txt	Drop now-converged callbackTagNamespace.types.diff.

Files not reviewed (3)

• internal/api/encoder/decoder_generated.go: Language not supported
• internal/api/encoder/encoder_generated.go: Language not supported
• internal/ast/ast_generated.go: Language not supported