Sub-4K content on a 4K TV was always upscaled by the playback device, so the TV's own (usually better) upscaler never received the native signal and could not apply resolution-specific processing.
Adds a Match Content Resolution setting on Android TV: playback picks the smallest display mode that still contains the video — never downscaling it — and rate-matches within that resolution when frame rate matching is also enabled. A resolution-only switch keeps the refresh rate as close to the current one as possible, and the settle watchdog now verifies the requested mode id so such switches still trigger the Android MPV decoder refresh. Transcodes get their target from decoded dimensions on the post-first-frame path. Mode selection is extracted into a pure, JVM-tested DisplayModeSelector.
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