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The UI Screens window enumerated with `is_build` while the PAK browser's inline preview composes anything `parse_build` accepts. So the browser drew screens this window flatly refused to list -- most visibly `palogo`, the publisher splash, which declares its sprites directly and has no `.rat` layout child. `compose_screen` now gates on `is_composable`, the documented superset (every `is_build` bundle passes it), so anything the list offers is drawable and the two presenters share one rule. A "Fragments" toggle widens the enumeration to it as well, off by default: the extra ~1786 bundles are mostly two-element fragments (a button beside its glow) that would bury the real screens. It re-scans, which renumbers the display ordinal -- harmless, because the pak ENTRY index is the locator and the stale catalog is cleared. The toggle sets a `rescan` flag rather than self-sending RequestScreenCatalog: a system that both reads and writes one event type is a B0002 panic at startup, which is how the Save browser broke. Also plumbs the last two ComposeOptions the CLI had and the UI did not -- `black backdrop` (what a framebuffer capture must be compared against) and `primitives` (decoded, but paint order unsolved; hover text says so). Verified: `screen render --all --build 13 GP_TITLE.pak` draws the SQUARE ENIX splash, 2/3 elements, the third being the .prm quad. Workspace builds, viewer reaches steady state, disc-gated suite 20/20 green. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>