Known limitations

Behaviour

Quick Connect is covered by the client's unit tests, not by the end-to-end screen tests (it polls every 5 s).
A server whose key changed shows a TLS error, not a dedicated dialog with both fingerprints.
If the PS4 keyboard cannot open (no signed-in user), the built-in editor needs a physical keyboard.
Subtitles are drawn at the bottom of the picture, under the progress bar while it shows (it hides after 4 s).
The stop report may be lost when the app is closed from the PS4 menu (the system ends the process).
Chinese subtitles use the Japanese forms of the Han characters (the fallback takes the first CJK face).
"En direct" shows the programme on now, not the next one; with very large channel lists (1000+) it builds one row per channel.
Live TV shows no message when the server has no channels.
Switching seasons very quickly may show the season asked first; a favourite pressed twice very quickly is sent twice with the same value.
A Resume or Next up row that changes after playback is updated at the next visit of the home screen.
The Linux --renderer gl mode does not drive the player.

While the focus moves, a frame takes about 14-19 ms on home and in a library grid (60 fps at rest: nothing is redrawn); most of the time is spent copying posters.
Starting and stopping a video shows 4-5 frames of about 95 ms (the spinner stutters) before the first picture.

Split the rasterizer's fillShape and turn its counters into an array indexed by an enum.
Share the GL and PS4 presenters; one helper for modal cards; Translator::plural on top of format.
A paged-grid helper for the video and music libraries; one JSON writer.
Split PlayerScreen (overlay, extras) and the error mapping of HttpClient::send.
Cache Label::measure by width.