Stop previous stream when a new one starts; ease animations

Starting a movie now closes the current decode engine and bumps a playback
generation so the stale video/audio threads stop themselves (they were
overlapping the movie's canvas and audio). PlaybackEngine.close is idempotent.
Animation records now honor their accelMode (linear/accel/decel easing).

README.md

@@ -8,21 +8,40 @@ a standalone player for PSP UMD Video ISO images: open a disc, render its real
 menu, and play the movie (H.264 video + ATRAC3+ audio) with mouse and
 keyboard/media-key controls.
 
-> **Status:** early development. Currently implemented: ISO 9660/UMD reading,
-> `param.sfo` metadata parsing, and file listing.
+> **Status:** playable. Opens a UMD Video ISO, plays the real RCO menu (rendered
+> from the disc), and plays the movie (H.264 video + ATRAC3+ audio).
 
 ## Build
 
-Requires JDK 21 (Gradle auto-provisions it via the Foojay toolchain resolver).
+Requires JDK 21 (Gradle auto-provisions it).
 
 ```sh
 ./gradlew build
 ```
 
-## Run
+## Run the player
 
 ```sh
-./gradlew cli:run --args="dump /path/to/disc.iso"
+./gradlew ui:run --args="/path/to/disc.iso"
+```
+
+Controls:
+
+- **↑ ↓ ← →** — navigate the menu
+- **Enter** — select
+- **M** — back to the menu
+- **S** — skip the current intro/track
+- **Space / P** — pause
+- **F11** — fullscreen
+
+## CLI
+
+The `cli` module has inspection/debug commands:
+
+```sh
+./gradlew cli:run --args="dump /path/to/disc.iso"          # metadata + playlist
+./gradlew cli:run --args="rco <iso> UMD_VIDEO/RESOURCE/EN100000.RCO"  # menu data
+./gradlew cli:run --args="play <iso> <streamName>"         # headless A/V sync test
 ```
 
 ## License