Add episode queueing picker and configurable mpv video output

Activating an episode now opens a scope picker (episode / season / whole
show) and plays the chosen queue back-to-back in one mpv instance, with
only the first item honoring its resume position. A new mpv `vo` driver
setting (CLI flag, env var, config file, and settings TUI) lets users
opt into terminal-based vos like sixel/kitty/tct, which auto-enable
mpv's terminal input so playback keys still work.

Co-Authored-By: Claude Opus 4.7 (1M context) <[email protected]>

src/config.rs

@@ -28,6 +28,11 @@ pub struct CliArgs {
     #[arg(long, env = "EMBY_SUBTITLE_LANG")]
     pub subtitle_lang: Option<String>,
 
+    /// mpv video output driver (e.g. `gpu`, `gpu-next`, `sixel`, `kitty`,
+    /// `drm`, `tct`). Forwarded to mpv's `vo`. Leave unset for mpv's default.
+    #[arg(long, env = "EMBY_VIDEO_OUTPUT")]
+    pub video_output: Option<String>,
+
     /// Path to config file. Defaults: ./config.toml then $XDG_CONFIG_HOME/emby-client/config.toml
     #[arg(short, long)]
     pub config: Option<PathBuf>,
@@ -44,6 +49,7 @@ pub struct FileConfig {
     pub password: Option<String>,
     pub audio_lang: Option<String>,
     pub subtitle_lang: Option<String>,
+    pub video_output: Option<String>,
 }
 
 #[derive(Debug, Clone)]
@@ -53,6 +59,9 @@ pub struct Config {
     pub password: String,
     pub audio_lang: Option<String>,
     pub subtitle_lang: Option<String>,
+    /// mpv `vo` driver, e.g. `gpu`, `sixel`, `kitty`, `drm`, `tct`. `None`
+    /// means we don't touch the property and mpv picks its default.
+    pub video_output: Option<String>,
 }
 
 pub fn load(args: &CliArgs) -> Result<(Option<Config>, Option<PathBuf>)> {
@@ -63,6 +72,7 @@ pub fn load(args: &CliArgs) -> Result<(Option<Config>, Option<PathBuf>)> {
     let password = args.password.clone().or(file_cfg.password);
     let audio_lang = args.audio_lang.clone().or(file_cfg.audio_lang);
     let subtitle_lang = args.subtitle_lang.clone().or(file_cfg.subtitle_lang);
+    let video_output = args.video_output.clone().or(file_cfg.video_output);
 
     let cfg = match (server, user, password) {
         (Some(server), Some(user), Some(password)) => Some(Config {
@@ -71,6 +81,7 @@ pub fn load(args: &CliArgs) -> Result<(Option<Config>, Option<PathBuf>)> {
             password,
             audio_lang,
             subtitle_lang,
+            video_output,
         }),
         _ => None,
     };
@@ -124,6 +135,7 @@ pub fn save(path: &Path, cfg: &Config) -> Result<()> {
         password: Some(cfg.password.clone()),
         audio_lang: cfg.audio_lang.clone(),
         subtitle_lang: cfg.subtitle_lang.clone(),
+        video_output: cfg.video_output.clone(),
     };
     let text = toml::to_string_pretty(&file_cfg).context("serializing config")?;
     std::fs::write(path, text).with_context(|| format!("writing {}", path.display()))?;