GeezerVison

Based on Kevin O's approved CR-286446486 ArbitraryDiff:
- Upgrade runtime to react_native_kepler_4 (manifest.toml)
- Upgrade all deps: RN 0.83, react 19.2, kepler-ui-components ~3.1,
  vega-carousel ~1.0, kepler-cli-platform ~0.22
- Halve all hardcoded pixel values for DIP (960x540 canvas on 1080p)
- Remove V1 carousel components (kepler-ui-components V1 unsupported on RN83)
- Update README with V2 carousel API docs and DIP section

manifest.toml: Add [needs.module] declaration for
react_native_kepler_4 runtime — required by SDK validator.

package-lock.json: Regenerated with correct resolved versions
from npm install (node 22, --legacy-peer-deps).

Add PixelUtils.ts (from KeplerTools-CoreUtils pattern) which scales
1080p UX values to dp using PixelRatio and the device's actual screen
height. This is future-proof across different device resolutions.

- manifest.toml: [os.version] min = target = 1.2, and the
  /com.amazon.vega.os@IVega_1_2 module in [needs], as the reference
  samples declare it for Vega OS 1.2.
- README: say which OS this branch targets and point Vega OS 2.0
  users to main.

- manifest.toml: [os.version] min = target = 2.0 (was 1.2 from
  release-rn-83) and drop the /com.amazon.vega.os@IVega_1_2 need, as
  the reference samples do on main. Vega SDK 2.0 refuses to build
  without [os.version].
- README: drop release-rn-83's Vega OS 1.2 note.
- Remove FlashList: its grid and row, the list switch, the FlashList-only
  card props and key extractors, and the demo video. On Vega OS 2.x the
  FlashList system bundle pulls in react-native-kepler-2, which the OS
  does not ship, so the app exited at launch.
- Declare recyclerlistview: vega-carousel imports it at runtime but lists
  it only as a devDependency; FlashList used to bring it in.
- package-lock.json: only the two dependency changes (npm uninstall /
  npm install from the base lockfile); every entry resolves from
  registry.npmjs.org.
- README: Carousel-only list sections and the Vega OS 2.0 / SDK 2.0
  requirement.

- Pagination: stop after an empty or a short page (new
  setPaginationHasMore reducer), de-duplicate requests by the row length
  they were made from (lastRequestedPage -> lastRequestedOffset), and
  restore that offset after a failed request so a later focus retries.
- Card memo comparators compare the image URL at the resolution the card
  renders, not a fixed '300' entry; DEFAULT_IMAGE_RESOLUTION is unused
  and removed.
- VerticalScrollable and HeterogeneousItemViewScrollable honor their
  selectionStrategy prop (default 'anchored').
- The grid carousel fills its tab container instead of the whole screen.
- Docs pointer from CarouselCardRow to the README's pagination section.
- Unit tests: paginationThunks (including a focus that arrives while a
  request is in flight), cardMemo and carouselProps (demo props and grid
  size) each fail with their fix reverted. rowData (no empty rows) and
  noFlashList are regression guards for earlier changes.
- README: the Branches table now gives each branch's Vega OS (main
  2.0, release-rn-83 1.2, release-rn-0.72 not set), a "Check the
  branch first" note
  for Vega SDK 2.0, vega CLI commands, and pagination and focus sections
  that match the code, including how a short page ends a row.
  carousel-demo README: the app renders the V2 carousel only.
- package.json: build scripts use react-native build-vega; perfTest uses
  vega exec perf with the app's component id.
- THIRD-PARTY-NOTICES regenerated from the dependency tree installed
  from registry.npmjs.org.

- vega run-app only launches the app when it is given the component
  id; without it the command installs the VPKG and stops. Use the same
  lines as PR #26: the component id, -d VirtualDevice or -d <DSN>, and
  the Vega Virtual Device (VVD) name in the VPKG list.
- Branches heads-up: only main and release-rn-83 set [os.version];
  release-rn-0.72 does not.

Target Vega OS 1.2 on release-rn-83

SCREEN_DIMENSION in constants.ts now reuses the window size that
scaleUxToDp reads, so the app has one source of screen size. A comment
says the one-time read at import is intentional: the TV window size is
fixed for the app's lifetime. PixelUtils imports nothing from the app,
so this adds no import cycle. No value changes.