fix: wrap JsonParseException into JsonSyntaxException (issue #2816) #2906
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Problem: Gson#fromJson declares JsonSyntaxException, but custom deserializers throwing JsonParseException leak that exception, violating the API contract.
Root cause: fromJson(JsonReader, TypeToken) lacks a catch block for JsonParseException.
Fix: Import JsonParseException and wrap it into JsonSyntaxException.
Tests: Added FromJsonExceptionTest verifying the wrap.
Risks: Minimal; only adds a catch block.
How to verify: Run mvnw.cmd test; the new test passes along with the existing suite.