feat(player): skipping an episode marks it watched, not paused

Skipping to the next episode left a mid-episode resume point behind, so
the skipped episode reappeared in Continue Watching with a partial
progress bar. Skipping means "done with this one", not "stopped here".

- reportSkippedEpisode marks the outgoing episode played instead of
  reporting a stop position, and arms a one-shot suppression consumed by
  the player's stop handler, so VideoPlayer's post-navigation unmount
  stop report can't overwrite the 100% progress with the partial one.
- Continue Watching drops resume entries superseded by Next Up: an
  in-progress episode whose series has a next-up entry strictly later in
  series order (season, then episode) is hidden from the Home and TV
  rows. Movies, series without a next-up entry, and items with unknown
  or mixed ordering are always kept.

Adds UR-059, DR-088, DR-089.

TRACES: UR-059 | DR-088, DR-089

src/lib/stores/tv.ts

@@ -1,10 +1,11 @@
 // TV library landing page data store.
 // Powers the focused TV landing: hero + horizontal sliders.
-// TRACES: UR-007, UR-023, UR-034 | DR-007, DR-038, DR-039
+// TRACES: UR-007, UR-023, UR-034, UR-059 | DR-007, DR-038, DR-039, DR-089
 import { writable, derived } from "svelte/store";
 import type { MediaItem } from "$lib/api/types";
 import { auth } from "./auth";
 import { buildHeroMix } from "$lib/utils/heroMix";
+import { filterSupersededResumeItems } from "./continueWatchingFilter";
 
 /** A single "by genre" row: the genre name plus the series in it. */
 export interface GenreRow {
@@ -81,7 +82,12 @@ function createTvStore() {
 
       // Resume items are already video-only from the server, but keep episodes
       // (and the occasional movie that lives in a mixed library) defensively.
-      const continueWatching = resume.filter(i => i.kind === "episode" || i.kind === "movie");
+      // Then drop episodes the user has moved past — a stale partial position
+      // behind the series' Next Up entry isn't something to continue.
+      const continueWatching = filterSupersededResumeItems(
+        resume.filter(i => i.kind === "episode" || i.kind === "movie"),
+        nextUp
+      );
 
       // Mix the hero: in-progress episodes first (most personal), then next-up,
       // recent additions, and random series from across the library.