fix(generator): use dynamic root type names in SelectionSets.ts

Replace hardcoded "Query" and "Mutation" type names with dynamic
references to actual root type names from the schema. This allows
schemas with custom root type names (e.g., QueryRoot, MutationRoot)
to work correctly.

Fixes #1353

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <[email protected]>

Author: jasonkuhrt

src/generator/generators/SelectionSets.ts

@@ -46,8 +46,8 @@ export const ModuleGeneratorSelectionSets = createModuleGenerator(
       parameters: $ScalarsTypeParameter,
       // dprint-ignore
       block: `
-        ${config.schema.kindMap.index.Root.query ? `query?: Record<string, Query<${i._$Scalars}>>` : ``}
-        ${config.schema.kindMap.index.Root.mutation ? `mutation?: Record<string, Mutation<${i._$Scalars}>>` : ``}
+        ${config.schema.kindMap.index.Root.query ? `query?: Record<string, ${renderName(config.schema.kindMap.index.Root.query)}<${i._$Scalars}>>` : ``}
+        ${config.schema.kindMap.index.Root.mutation ? `mutation?: Record<string, ${renderName(config.schema.kindMap.index.Root.mutation)}<${i._$Scalars}>>` : ``}
       `,
     }))
     code``