Paused playback could remain stuck after the screensaver destroyed its video and OSD surfaces, leaving later resume and initialization blocked.
Attach video and OSD surfaces together, drain placeholder frames, and bound surface retirement with explicit failure handling. Preserve native surface ownership through teardown and cover recreation, pause preservation, and disposal.
close#2249
Emoji and other supplementary-plane characters in titles, file names, and
subtitle paths were corrupted on the Android MPV path, and malformed bytes
from mpv logs could abort under CheckJNI. NewStringUTF/GetStringUTFChars
speak JNI's modified UTF-8, not the standard UTF-8 mpv produces and
consumes; the native lead-byte filter and the Kotlin surrogate scrubber
ran on the wrong side of that conversion and could not recover it.
Both directions now go through UTF-16 (NewString/GetStringChars) with a
small JNI-free transcoder that replaces malformed input with U+FFFD, the
same policy as shared/cpp/sanitize_utf8.h on desktop. The header is
covered by the Android host native test harness.
edde746