docs(changelog): the two review fixes users would notice

The tag message counted twelve defects while the changelog described ten. Both
of the missing ones are user-visible and belong in the user-facing artifact: a
quality ceiling that outlived the episode it was chosen for, and a seek that
outlived the file it was meant for.

The third review fix — collapsing two identical URL helpers — is not here on
purpose. Nobody using the app can tell.

CHANGELOG.md

@@ -82,6 +82,17 @@ fact about the platform rather than asking the thing that would know.
   code that had stopped being Linux-only, and the Android build had not compiled
   since. (DR-247)
 
+- **A quality you chose for one episode no longer caps every episode after it.**
+  Dropping the quality mid-episode is meant to describe that episode. When the
+  next one started in the background, nothing reset it — so the ceiling stayed
+  in force indefinitely, with nothing in the interface saying why later episodes
+  looked worse. (DR-254)
+
+- **Skipping to the next item no longer starts it part-way through.** Scrubbing
+  near the end of a converted stream re-opens it, and the position being waited
+  for was not discarded if you skipped onward first — so the next item began
+  wherever you had dragged to in the previous one. (DR-253)
+
 ### 🧹 Under the hood
 
 - The conformance suite can be run on its own: `bun run test:player` for the