Third os-vps app to land in the catalog, and the lightest: a macOS-Preview-style quick-look surface for image/video/audio/pdf/text. The lift follows the editors' host-seam recipe — lib/host.ts is the ONLY coupling point, with two injectable seams: configureMediaSource maps fs paths to fetchable URLs (identity default, so public URLs need zero wiring) and configureMediaOpener routes the Open-in-editor handoff to whatever shell hosts it. Launched bare it runs a fully offline sample gallery. Pairs naturally with file-explorer (onOpenFile → payload) and the image/reel editors.

VP wave. Slices now declare a machine-readable `previews` block in slice.json (enum variant axes for leaf slices, scenario presets for subsystems) rendered by a sibling preview.tsx fed by localStorage demo data (createDemoStore, rr-demo:<slug> — client-only, zero VPS compute). gen-preview-registry.mjs emits lib/preview/{registry.gen.ts, preview-meta.gen.json} — one code-split dynamic import per slug, nothing hardcoded. The Bundle Builder mounts <VariantPreview> with auto-generated knobs for every selected slice, and a Builder AI panel (key-guarded /api/build-chat) function-calls the dynamic tool surface (list_slices / get_slice / preview_slice / compose_bundle — tool defs built at request time from the catalog + preview metadata) and renders validated preview_slice calls live. Pilots: full-width-toggle (variants), markdown (tabs × content axes), notion-database (table/board/list/chart scenarios). preview.tsx is rr-internal — `rr add` strips it. Spec: docs/SLICE-PREVIEW-SPEC.md.

Drift burn-down after the editors lift. appshell 1.1.0 ports the per-window close guard (setCloseGuard + AppProps.winId — apps can block close on unsaved work); audit confirmed multi-window, snap-grid geometry and stable capability refs were already in the rr copy. file-explorer 1.1.0 ports the Files-app UX fixes: the details panel always renders (selected entry or current folder) with a copy-path button, and mutation errors surface the REAL backend message through a friendly() mapper instead of a generic mask.

Two os-vps creative apps land as catalog slices. reel-editor (NEW): a complete in-browser NLE — layered multi-track timeline (top row renders frontmost), one Canvas-2D draw path shared by preview AND realtime WebM exporter (real mixed audio), keyframes/easing/presets, transitions, text styling, color grading, 6 resizable workspace layouts, quick-import files pane on an injectable fs adapter (configureReelFs, in-memory mock default), sonner toasts. image-editor v2 (BREAKING): rebuilt editor replaces v1 — AI function-calling command registry (EDITOR_COMMANDS + useEditorCommands + in-editor chat) with an injectable stream bridge (configureAgentStream; chat optional), headless server.ts command runner, layer styles, tool rail chrome. Both slices were refactored upstream so every file passes the 200-LOC gate. dashboard-ide layout preview rebuilt as a real IDE: lazy explorer (per-folder fetch on expand, listing + DOM dropped on collapse — node_modules costs nothing until opened), open-file tabs, one-body editor, status bar.

prepublishOnly gates were red. Fixed: image-picker deps.env string → typed object (UNSPLASH_ACCESS_KEY, scope server, optional); slice-schema gains optional deps.sharedFiles (notion-database / notion-shell already used it); version/title parity synced for resend-newsletter (0.1.3), ai-chat (0.2.0), landing-sections (0.2.0), markdown title; deleted stale template-base/frontend/slices/notion port-staging copy (R1 dual-home); AiChatFab refactored props-driven — convex/react import replaced with injected `chat` prop (R3).

md-reader renamed to `markdown` and maximised. <MarkdownPage> adds optional surfaces: Read (rich text), Write (raw source editor with snippet toolbar + live preview), Review (block-anchored comments with add/resolve — controlled callbacks or internal fallback). Fenced ```mermaid blocks render as SVG diagrams (dynamic-imported mermaid) and ```chart blocks as recharts bar/line/area/pie from a JSON spec. Notion sync grammar unchanged.

New read-only surface that renders a markdown string as a clean document (headings, lists, todo, callouts, fenced code, KaTeX, tables, images, toggles, inline marks). Sync with the notion block editor is by shared grammar: a new notion bridge (blocksToMarkdown / markdownToBlocks) serialises blocks ↔ the exact markdown this reader parses — so anything readable as a notion page is readable here, and back. Self-contained (own parser + inline renderer, no notion runtime dep). 21 tests.

Reverting to the shadcn Calendar broke picking again (it's the unreliable part here); the self-contained DateCalendar grid is what works. Restored it and added Notion-style range picking: with End date on, click 1 = start, click 2 = end (the earlier of the two is always kept as start, so clicking before the start swaps them); clicking once a full range exists starts a fresh range.

Root cause: the repo pinned react-day-picker ^10.0.0, but this shadcn Calendar component is generated for rdp v9; v10's breaking changes silently stopped the controlled mode/selected/onSelect path from registering day clicks (same bug in notion-page-clone). Fix: pin react-day-picker to ^9.14.0 (what the shadcn Calendar targets) and restore the canonical Popover + Calendar date picker (mode=single / mode=range).