fix(quickjs): preserve accessor descriptors from proxy getOwnPropertyDescriptor traps

[NathanWalker]

js_proxy_get_own_property stored the js_obj_to_desc() result directly into
*pdesc, but js_obj_to_desc produces defineProperty-style flags
(JS_PROP_HAS_GET/JS_PROP_HAS_SET) while JSPropertyDescriptor consumers test
JS_PROP_GETSET. Any accessor descriptor returned by a Proxy
getOwnPropertyDescriptor trap therefore degraded to {value: undefined},
which broke every metadata-installed property on class prototypes exposed
through the JSI install script's Proxy (UIDevice.currentDevice.systemVersion
returned undefined and @nativescript/core crashed at boot in
NSString.stringWithString). Convert the flags to own-property form
(CompletePropertyDescriptor) before publishing the descriptor.

Reproduces in pure JS, also present in upstream quickjs-ng:
const t = {};
Object.defineProperty(t, 'x', {configurable: true, get: () => 42});
const p = new Proxy(t, {getOwnPropertyDescriptor: Reflect.getOwnPropertyDescriptor});
Object.getOwnPropertyDescriptor(p, 'x') // was {value: undefined}, now accessor

Found while bringing @nativescript/core up on the ios-quickjs runtime flavor. The seven fixes in this series were validated together on the iOS 26.5 simulator (combined branch: fix/run-main-application-entry): a SolidJS + dominative app boots, renders, and runs stably with all of them applied. Each PR is independent and cherry-picked onto main.

🤖 Generated with Claude Code

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