Export path leaks streams in java/src/processing/mode/java/JavaBuild.java and can hang on malformed jar entries

Not seeing this reported yet, so filing it.

While checking export code, spotted a few stream/zip handling bugs in java/src/processing/mode/java/JavaBuild.java:

• new FileInputStream(...) is passed into saveStream() in multiple places, but that source stream is never closed.

• ZipFile.getInputStream(entry) is also left open.

• ZipFile itself is only closed on the happy path.

• In the jar-entry read loop, if read() returns -1, remaining goes the wrong way and the loop can run forever.

This is in the Export Application path, so it’s not edge-only. Repeated exports can leak FDs/handles (worse on Windows due to file locks), and a bad/truncated jar can stall export.