Fix CRT shader: use plain &crtShader=true query param in TranscodingUrl

Previous approach used streamOptions[crtShader]=true (wrong format).
ParseStreamOptions on the server reads IQueryCollection directly and
stores keys verbatim — so streamOptions[crtShader] becomes the key,
not crtShader, and TryGetValue("crtShader") always returns false.

Plain &crtShader=true works because ParseStreamOptions adds any
lowercase-starting query param directly to the StreamOptions dict.

Also remove the dead PlaybackInfoDto.StreamOptions code — that DTO
has no StreamOptions field, so it was silently ignored.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/components/playback/playbackmanager.js

@@ -470,9 +470,6 @@ async function getPlaybackInfo(player, apiClient, item, deviceProfile, mediaSour
     if (options.allowAudioStreamCopy != null) {
         query.AllowAudioStreamCopy = options.allowAudioStreamCopy;
     }
-    if (options.streamOptions) {
-        query.StreamOptions = options.streamOptions;
-    }
     if (mediaSourceId) {
         query.MediaSourceId = mediaSourceId;
     }
@@ -1750,14 +1747,6 @@ export class PlaybackManager {
 
                 const currentPlayOptions = currentItem.playOptions || getDefaultPlayOptions();
 
-                const crtStreamOptions = (function () {
-                    const pd = getPlayerData(player);
-                    if (!pd.enableCrtShader) return undefined;
-                    const opts = { crtShader: 'true' };
-                    if (pd.crtShadowMask != null) opts.crtShadowMask = String(pd.crtShadowMask);
-                    return opts;
-                })();
-
                 const options = {
                     maxBitrate,
                     startPosition: ticks,
@@ -1767,8 +1756,7 @@ export class PlaybackManager {
                     enableDirectPlay: params.EnableDirectPlay,
                     enableDirectStream: params.EnableDirectStream,
                     allowVideoStreamCopy: params.AllowVideoStreamCopy,
-                    allowAudioStreamCopy: params.AllowAudioStreamCopy,
-                    streamOptions: crtStreamOptions
+                    allowAudioStreamCopy: params.AllowAudioStreamCopy
                 };
 
                 getPlaybackInfo(player, apiClient, currentItem, deviceProfile, currentMediaSource.Id, liveStreamId, options).then(function (result) {
@@ -2890,7 +2878,17 @@ export class PlaybackManager {
 
                     playMethod = mediaSource.SupportsDirectPlay ? 'DirectPlay' : 'DirectStream';
                 } else if (mediaSource.SupportsTranscoding) {
-                    const transcodingUrl = mediaSource.TranscodingUrl;
+                    let transcodingUrl = mediaSource.TranscodingUrl;
+
+                    // Append CRT shader options as plain query params so ParseStreamOptions
+                    // on the server picks them up (key must start lowercase, no streamOptions[] wrapper).
+                    if (getPlayerData(player).enableCrtShader) {
+                        transcodingUrl += '&crtShader=true';
+                        const maskVal = getPlayerData(player).crtShadowMask;
+                        if (maskVal !== undefined && maskVal !== null) {
+                            transcodingUrl += '&crtShadowMask=' + maskVal;
+                        }
+                    }
 
                     mediaUrl = apiClient.getUrl(transcodingUrl);