fix: resolve 13 review issues across casting components

- casting-player: remove redundant self-navigation useEffect
- casting-player: derive Type from metadata instead of hardcoding 'Movie'
- casting-player: pass null to useTrickplay instead of empty BaseItemDto
- casting-player: use != null for skip time labels (allow 0 to render)
- Chromecast: case-insensitive m3u8 detection via regex
- Chromecast: fix UUID hyphen indices to 4,6,8,10 for proper v4 format
- CastingMiniPlayer: use SeriesPrimaryImageTag for series poster URL
- ChromecastConnectionMenu: send rounded volume to castSession.setVolume
- ChromecastConnectionMenu: use isMutedRef in onValueChange to avoid stale closure
- ChromecastDeviceSheet: skip volume sync during active sliding
- ChromecastDeviceSheet: move unmute logic from onValueChange to onSlidingStart
- useCasting: detect playback start via isPlaying/playerState, not just progress>0
- useCasting: derive isChromecastAvailable from castState instead of hardcoding true
- useTrickplay: accept BaseItemDto|null with null guards on Id access

app/(auth)/casting-player.tsx

@@ -168,10 +168,18 @@ export default function CastingPlayerScreen() {
     // Priority 3: Create minimal fallback while loading
     if (mediaStatus?.mediaInfo) {
       const { contentId, metadata } = mediaStatus.mediaInfo;
+      // Derive type from metadata if available, otherwise omit to avoid
+      // misrepresenting episodes as movies
+      let metadataType: string | undefined;
+      if (metadata?.type === "movie") {
+        metadataType = "Movie";
+      } else if (metadata?.type === "tvShow") {
+        metadataType = "Episode";
+      }
       return {
         Id: contentId,
         Name: metadata?.title || "Unknown",
-        Type: "Movie", // Temporary until API fetch completes
+        ...(metadataType ? { Type: metadataType } : {}),
         ServerId: "",
       } as BaseItemDto;
     }
@@ -188,7 +196,7 @@ export default function CastingPlayerScreen() {
 
   // Trickplay for seeking preview - use fetched item with full data
   const { trickPlayUrl, calculateTrickplayUrl, trickplayInfo } = useTrickplay(
-    fetchedItem ?? ({} as BaseItemDto),
+    fetchedItem ?? null,
   );
 
   // Update slider max when duration changes
@@ -494,13 +502,10 @@ export default function CastingPlayerScreen() {
     api,
   ]);
 
-  // Auto-navigate to player when casting starts (if not already on player screen)
-  useEffect(() => {
-    if (mediaStatus?.currentItemId && !currentItem) {
-      // New media started casting while we're not on the player
-      router.replace("/casting-player" as const);
-    }
-  }, [mediaStatus?.currentItemId, currentItem, router]);
+  // NOTE: Auto-navigation to casting-player is handled by higher-level
+  // components (e.g., CastingMiniPlayer or Chromecast button). We intentionally
+  // do NOT call router.replace("/casting-player") here because this component
+  // IS the casting-player screen — doing so would cause redundant navigation loops.
 
   // Segment detection (skip intro/credits) - use progress in seconds for accurate detection
   const { currentSegment, skipIntro, skipCredits, skipSegment } =
@@ -1275,7 +1280,7 @@ export default function CastingPlayerScreen() {
                   color='white'
                   style={{ transform: [{ scaleY: -1 }, { rotate: "180deg" }] }}
                 />
-                {!!settings?.rewindSkipTime && (
+                {settings?.rewindSkipTime != null && (
                   <Text
                     style={{
                       position: "absolute",
@@ -1320,7 +1325,7 @@ export default function CastingPlayerScreen() {
                 }}
               >
                 <Ionicons name='refresh-outline' size={48} color='white' />
-                {!!settings?.forwardSkipTime && (
+                {settings?.forwardSkipTime != null && (
                   <Text
                     style={{
                       position: "absolute",

components/Chromecast.tsx

@@ -121,7 +121,7 @@ export function Chromecast({
       randomBytes[8] = (randomBytes[8] & 0x3f) | 0x80; // Variant 10
       const uuid = Array.from(randomBytes, (b, i) => {
         const hex = b.toString(16).padStart(2, "0");
-        return [3, 5, 7, 9].includes(i) ? `-${hex}` : hex;
+        return [4, 6, 8, 10].includes(i) ? `-${hex}` : hex;
       }).join("");
       playSessionIdRef.current = uuid;
       lastContentIdRef.current = contentId;
@@ -130,7 +130,7 @@ export function Chromecast({
     const positionTicks = Math.floor(streamPosition * 10000000);
     const isPaused = mediaStatus.playerState === "paused";
     const streamUrl = mediaStatus.mediaInfo.contentUrl || "";
-    const isTranscoding = streamUrl.includes("m3u8");
+    const isTranscoding = /m3u8/i.test(streamUrl);
 
     const progressInfo: PlaybackProgressInfo = {
       ItemId: contentId,

components/casting/CastingMiniPlayer.tsx

@@ -45,9 +45,9 @@ export const CastingMiniPlayer: React.FC = () => {
     return mediaStatus?.mediaInfo?.customData as BaseItemDto | undefined;
   }, [mediaStatus?.mediaInfo?.customData]);
 
-  // Trickplay support - pass currentItem as BaseItemDto or empty object
+  // Trickplay support - pass currentItem as BaseItemDto or null
   const { trickPlayUrl, calculateTrickplayUrl, trickplayInfo } = useTrickplay(
-    currentItem || ({} as BaseItemDto),
+    currentItem || null,
   );
   const [trickplayTime, setTrickplayTime] = useState({
     hours: 0,
@@ -121,7 +121,7 @@ export const CastingMiniPlayer: React.FC = () => {
     }
   }, [progress, sliderProgress]);
 
-  // For episodes, use season poster; for other content, use item poster
+  // For episodes, use series poster; for other content, use item poster
   const posterUrl = useMemo(() => {
     if (!api?.basePath || !currentItem) return null;
 
@@ -131,8 +131,8 @@ export const CastingMiniPlayer: React.FC = () => {
       currentItem.ParentIndexNumber !== undefined &&
       currentItem.SeasonId
     ) {
-      // Build season poster URL using SeriesId and image tag for cache validation
-      const imageTag = currentItem.ImageTags?.Primary || "";
+      // Build series poster URL using SeriesId and series-level image tag
+      const imageTag = currentItem.SeriesPrimaryImageTag || "";
       const tagParam = imageTag ? `&tag=${imageTag}` : "";
       return `${api.basePath}/Items/${currentItem.SeriesId}/Images/Primary?fillHeight=120&fillWidth=80&quality=96${tagParam}`;
     }

components/chromecast/ChromecastConnectionMenu.tsx

@@ -108,7 +108,7 @@ export const ChromecastConnectionMenu: React.FC<
 
       try {
         if (castSession) {
-          await castSession.setVolume(value / 100);
+          await castSession.setVolume(rounded / 100);
         }
       } catch (error) {
         console.error("[Connection Menu] Volume error:", error);
@@ -262,7 +262,9 @@ export const ChromecastConnectionMenu: React.FC<
                     onValueChange={async (value) => {
                       volumeValue.value = value;
                       handleVolumeChange(value);
-                      if (isMuted) {
+                      // Unmute when adjusting volume - use ref to avoid
+                      // stale closure and prevent repeated async calls
+                      if (isMutedRef.current) {
                         isMutedRef.current = false;
                         setIsMuted(false);
                         try {

components/chromecast/ChromecastDeviceSheet.tsx

@@ -45,7 +45,9 @@ export const ChromecastDeviceSheet: React.FC<ChromecastDeviceSheetProps> = ({
   const lastSetVolume = useRef(Math.round(volume * 100));
 
   // Sync volume slider with prop changes (updates from physical buttons)
+  // Skip updates while user is actively sliding to avoid overwriting drag
   useEffect(() => {
+    if (isSliding.current) return;
     volumeValue.value = volume * 100;
     setDisplayVolume(Math.round(volume * 100));
   }, [volume, volumeValue]);
@@ -275,13 +277,9 @@ export const ChromecastDeviceSheet: React.FC<ChromecastDeviceSheetProps> = ({
                         minimumTrackTintColor: isMuted ? "#666" : "#a855f7",
                         bubbleBackgroundColor: "#a855f7",
                       }}
-                      onSlidingStart={() => {
+                      onSlidingStart={async () => {
                         isSliding.current = true;
-                      }}
-                      onValueChange={async (value) => {
-                        volumeValue.value = value;
-                        handleVolumeChange(value);
-                        // Unmute when adjusting volume
+                        // Auto-unmute when user starts adjusting volume
                         if (isMuted && castSession) {
                           setIsMuted(false);
                           try {
@@ -292,6 +290,10 @@ export const ChromecastDeviceSheet: React.FC<ChromecastDeviceSheetProps> = ({
                           }
                         }
                       }}
+                      onValueChange={(value) => {
+                        volumeValue.value = value;
+                        handleVolumeChange(value);
+                      }}
                       onSlidingComplete={(value) => {
                         isSliding.current = false;
                         lastSetVolume.current = Math.round(value);

hooks/useCasting.ts

@@ -120,8 +120,13 @@ export const useCasting = (item: BaseItemDto | null) => {
     const playStateApi = getPlaystateApi(api);
 
     // Report playback start when media begins (only once per item)
+    // Don't require progress > 0 — playback can legitimately start at position 0
     const currentState = stateRef.current;
-    if (hasReportedStartRef.current !== item.Id && currentState.progress > 0) {
+    const isPlaybackActive =
+      currentState.isPlaying ||
+      mediaStatus?.playerState === "playing" ||
+      currentState.progress > 0;
+    if (hasReportedStartRef.current !== item.Id && isPlaybackActive) {
       // Set synchronously before async call to prevent race condition duplicates
       hasReportedStartRef.current = item.Id || null;
 
@@ -366,8 +371,11 @@ export const useCasting = (item: BaseItemDto | null) => {
     duration: state.duration,
     volume: state.volume,
 
-    // Availability
-    isChromecastAvailable: true, // Always available via react-native-google-cast
+    // Availability - derived from actual cast state
+    isChromecastAvailable:
+      castState === CastState.CONNECTED ||
+      castState === CastState.CONNECTING ||
+      castState === CastState.NOT_CONNECTED,
 
     // Raw clients (for advanced operations)
     remoteMediaClient: client,

hooks/useTrickplay.ts

@@ -17,20 +17,24 @@ interface TrickplayUrl {
 }
 
 /** Hook to handle trickplay logic for a given item. */
-export const useTrickplay = (item: BaseItemDto) => {
+export const useTrickplay = (item: BaseItemDto | null) => {
   const { getDownloadedItemById } = useDownload();
   const [trickPlayUrl, setTrickPlayUrl] = useState<TrickplayUrl | null>(null);
   const lastCalculationTime = useRef(0);
   const throttleDelay = 200;
   const isOffline = useGlobalSearchParams().offline === "true";
-  const trickplayInfo = useMemo(() => getTrickplayInfo(item), [item]);
+  const trickplayInfo = useMemo(
+    () => (item ? getTrickplayInfo(item) : null),
+    [item],
+  );
 
   /** Generates the trickplay URL for the given item and sheet index.
    * We change between offline and online trickplay URLs depending on the state of the app. */
   const getTrickplayUrl = useCallback(
     (item: BaseItemDto, sheetIndex: number) => {
+      if (!item.Id) return null;
       // If we are offline, we can use the downloaded item's trickplay data path
-      const downloadedItem = getDownloadedItemById(item.Id!);
+      const downloadedItem = getDownloadedItemById(item.Id);
       if (isOffline && downloadedItem?.trickPlayData?.path) {
         return `${downloadedItem.trickPlayData.path}${sheetIndex}.jpg`;
       }
@@ -45,7 +49,7 @@ export const useTrickplay = (item: BaseItemDto) => {
       const now = Date.now();
       if (
         !trickplayInfo ||
-        !item.Id ||
+        !item?.Id ||
         now - lastCalculationTime.current < throttleDelay
       )
         return;
@@ -62,7 +66,7 @@ export const useTrickplay = (item: BaseItemDto) => {
 
   /** Prefetches all the trickplay images for the item, limiting concurrency to avoid I/O spikes. */
   const prefetchAllTrickplayImages = useCallback(async () => {
-    if (!trickplayInfo || !item.Id) return;
+    if (!trickplayInfo || !item?.Id) return;
     const maxConcurrent = 4;
     const total = trickplayInfo.totalImageSheets;
     const urls: string[] = [];