fix(runtime): PropSerialize not called for JSX props before instance creation

[Jagget]

Props with @PropSerialize set via JSX before lazy instance creation did not have serialized values reflected to DOM attributes.

Cause

In set-value.ts, serializer logic was wrapped in if (instance && ...), skipping serialization when instance was undefined.

Solution

Queue serialization to $fetchedCbList$ when instance doesn't exist, following the pattern used for @Watch callbacks.

Files Changed

• src/runtime/set-value.ts - Queue serializer when no instance
• src/runtime/test/prop-serialize.spec.tsx - Added regression test