BridgeJS: Fix property codegen using unqualified type name for namespace-nested classes

[krodak]

Overview

Property getter/setter thunks for classes nested inside @JS enum namespaces used the bare class name (e.g. Converter) instead of the qualified name (e.g. Utils.Converter) for the _self parameter type. This causes compilation failures when another type with the same name exists at module scope.

Methods, constructors, deinit, and extensions already used swiftCallName (qualified). Only properties were broken.

Fix: Add a swiftCallName computed property to PropertyRenderingContext and use it for the _self parameter in both getter and setter codegen, matching what methods already do.

Before (generated getter):

let ret = Converter.bridgeJSLiftParameter(_self).precision

After:

let ret = Utils.Converter.bridgeJSLiftParameter(_self).precision

Tests: added precision: Int instance property to the Utils.Converter class in both the snapshot test input and the e2e runtime test. All 104 plugin tests and 141 e2e tests pass.