Auto-imports hits unimplemented `GetSourceOfProjectReferenceIfOutputIncluded`

@DanielRosenwasser đang làm issue này rồi.

Từ ngày 30/6/2026.

• #4482 của @copilot-swe-agent — đã đóng, không merge

```
internal/ls/autoimport.(*aliasResolver).GetSourceOfProjectReferenceIfOutputIncluded()
internal/ls/autoimport/aliasresolver.go:214
internal/modulespecifiers.GetModuleSpecifiersWithInfo()
internal/modulespecifiers/specifiers.go:66
internal/modulespecifiers.GetModuleSpecifiers()
internal/modulespecifiers/specifiers.go:29
internal/checker.(*NodeBuilderImpl).getSpecifierForModuleSymbol()
internal/checker/nodebuilderimpl.go:1288
internal/checker.(*NodeBuilderImpl).getSymbolChain.func1()
internal/checker/nodebuilderimpl.go:1087
internal/core.Map[...]()
internal/core/core.go:86
internal/checker.(*NodeBuilderImpl).getSymbolChain()
internal/checker/nodebuilderimpl.go:1085
internal/checker.(*NodeBuilderImpl).lookupSymbolChainWorker()
internal/checker/nodebuilderimpl.go:1054
internal/checker.(*NodeBuilderImpl).lookupSymbolChain()
internal/checker/nodebuilderimpl.go:1046
internal/checker.(*NodeBuilderImpl).symbolToTypeNode()
internal/checker/nodebuilderimpl.go:625
internal/checker.(*NodeBuilderImpl).typeToTypeNode()
internal/checker/nodebuilderimpl.go:3366
internal/checker.(*NodeBuilderImpl).mapToTypeNodes()
internal/checker/nodebuilderimpl.go:396
internal/checker.(*NodeBuilderImpl).typeReferenceToTypeNode()
internal/checker/nodebuilderimpl.go:3042
internal/checker.(*NodeBuilderImpl).typeToTypeNode()
internal/checker/nodebuilderimpl.go:3331
internal/checker.(*NodeBuilderImpl).serializeTypeForDeclaration()
internal/checker/nodebuilderimpl.go:2252
internal/checker.(*NodeBuilderImpl).addPropertyToElementList()
internal/checker/nodebuilderimpl.go:2567
internal/checker.(*NodeBuilderImpl).createTypeNodesFromResolvedType()
...
```