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Implement approved TV loading and bounded motion

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# Wolfskin TV specification — revision 5
# Wolfskin TV specification — revision 6
2026-11-06. This feedback amendment applies to the approved revision-4 specification and frozen frames at `data/tv-v2/focus-2026-11-06/` (prototype SHA-256 `1bb7f4097a5303a58e45ec5e61cf867fa6cfdcbfe12fc7a196f00acacae5e48d`). Unchanged geometry, navigation, typography, colours and motion remain governed by those frames and the [written specification](https://pages.justinvisser.org/wolfskin/tv-spec). The amendment's prototype delta is `data/tv-v2/feedback-2026-11-06/`.
2026-11-06. Revision 6 adds the approved direction-A motion and loading states from [the motion reference](https://pages.justinvisser.org/wolfskin/tv-motion-speed.html), frozen with SHA-256 checksums at `data/tv-v2/motion-2026-11-06/`. Revision-5 feedback below still applies. Unchanged static geometry, navigation, typography and colours remain governed by the approved frames and the [written specification](https://pages.justinvisser.org/wolfskin/tv-spec). The revision-5 prototype delta remains `data/tv-v2/feedback-2026-11-06/`.
## Who’s watching
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Every Discover lane, including Movies for you, Series for you, service entries, service-specific lanes and Hidden picks, uses a **104 px heading band**: heading line plus **60 px heading-to-card gap**, up from 40 px. This is a consistent Level 2 extension, not a Series-only exception. Poster shelves become 652 px high and service-entry shelves 316 px. Captions and frame scroll offsets use the same heading band. Home headings remain unchanged.
## Motion and loading — revision 6
Home heroes and shelves, Library rows, Discover hero/lanes, title headers, episodes and cast, and person headers/filmography use shaped placeholders without loading sentences. The placeholder fill is `surface2` (`#1b1b25`). A complete shelf shares **one** alpha layer: **0.55 → 1 → 0.55 over 1400 ms**, CSS ease-in-out (`.42,0,.58,1`), 700 ms each way. No per-card clocks, staggered pulse phases, shimmer, moving gradient, or animated blur.
| Transition | Duration and curve | Transform |
|---|---|---|
| Focus scale/ring | 180 ms, ease-out (`.33,1,.68,1`) | Existing locked focus scale; no geometry change |
| Poster caption in / out | 60 ms delay + 180 ms ease-out / 100 ms ease-out | 10 px rise on entry |
| Network artwork only | 160 ms, Coil painter alpha | None; memory, disk and local hits are instant |
| Row/tab content reveal | 180 ms, ease-out | One layer per row, 24 px rise |
| Initial hero/title copy | 180 ms, ease-out | 16 px rise |
| Hero backdrop hand-off | 320 ms, ease-in-out (`.65,0,.35,1`) | Alpha only; retain previous art until incoming art or its final fallback is ready |
| Hero copy hand-off | Old copy out 120 ms ease (`.25,.1,.25,1`); new copy starts at 140 ms and enters over 200 ms ease-out | 14 px rise on entry |
| Late readiness line | 200 ms, ease | Alpha only, in its reserved slot |
| Horizontal / vertical focus-follow scroll | 160 ms ease / 180 ms ease-out | Existing scroll geometry |
Row reveals are grouped rather than the browser prototype's per-card staging: the armv7 frame budget permits one animated layer per shelf, not one per card. Tabs have no full-screen transition layer. The upper Home hero blend is bounded to **1920×820 px**, Discover to **1920×740 px**; the lower backdrop changes without an animated screen-sized layer. Hero copy is a separate bounded block. Image reveal uses Coil's painter, not a new full-screen compositing layer. Existing poster-only blur is static.
The title page's scroll dim is a draw-only colour overlay, not an alpha-animated full-screen layer. Discover scrolls its backdrop through placement offsets rather than a full-screen translation layer. Initial loading animation owners are Home **2**, Library **up to 3** lazy rows, Discover **2**, title header **1**, person **2**; pending title episode/cast shelves add **1 each**, and each pending Discover lane owns **1**. Deep Home loading is bounded to **4** visible shelf layers. These are active animation owners, not every static display-list node. A hero hand-off adds at most **2** bounded owners (outgoing art and copy). Focus changes can animate **2** card transforms, **1** caption and at most **2** rating plates; artwork fades are painter draws without additional compositing layers. No animated owner is full-screen.
The series readiness band reserves **56 px (28 dp)** from its first content paint, including when empty or when readiness later disappears. Ratings remain inside the fixed-height facts band. The series header's measured height therefore cannot change when late ratings/readiness arrive; overview, actions, season and episode anchors retain their coordinates. Skeletons have no click/hover focus targets; pending episode/cast rows remain absent from the key-navigation state until real cards exist. Initial loading keeps nav focus and Back still pops the title/person route.
Discover key traversal skips pending lanes in both directions. If every remaining lane is pending, Down stays on the real filter chips and Back returns to nav; a skeleton must never create an empty-column focus range.
`Settings.Global.ANIMATOR_DURATION_SCALE == 0`, exposed by Compose's window `MotionDurationScale`, or the host's `LocalReducedMotion` flag disables pulse and translation/scroll motion. Focus scale and nav geometry snap; permitted fades are capped at **80 ms**. The window context supplies live scale state without settings or disk reads on the main thread. Fetch/decode dispatchers and image URL logic are unchanged.
Native **1920×1080** before/after frames and the frame-budget inventory are published at [the motion build proof](https://pages.justinvisser.org/wolfskin/tv-motion-build/). Before frames use the pre-change surface sources in this same isolated worktree; after frames use the shipped Compose surfaces. No device access, installation or optimized APK is part of this lane. On-box acceptance remains: no series layout change after first content, Home scrolling no worse than **39.6% janky / p90 65 ms**. Native JVM rendering does not measure that GPU/frame-timing target.
## Sources and verification
Authoritative changed values live in `wolfskin-design/tokens.json`, `title-tokens.json` and `discover-tokens.json`; regenerate Kotlin, CSS and the drift manifest with `python3 wolfskin-design/generate_tokens.py`.
`MotionSurfaceTest`, `HeroMotionTest`, `NetworkArtTransitionTest` and `DiscoverSkeletonKeysTest` cover late-line geometry, loading/ready row eligibility, Back/nav ownership, rendered pulse suppression under both motion controls, strict main-thread I/O policy, network-versus-cache reveal, bounded hero blending, delayed art and interrupted hand-offs. Manually clocked captures explicitly deliver snapshot changes before advancing animation time. The frozen prototype includes `index.html`, its local media, the original CSS/JS/builder and a complete SHA-256 manifest; replay the HTML, not the preserved builder's live-publishing entry point.
The feedback prototype delta links the native 1920×1080 before/after frames. `HomeViewportTest` exercises short and long poster/tile/wide rows, first focus, both row directions and native Back from the shipped title surface. The real-Bear capture harness reads recorded Jellyfin metadata through `TitleReadFacade`; it is a throwaway proof and is not shipped. The final gates are `make test` and `make apk-debug`. No TV access or optimized-APK build is part of this worker's validation.