[horner]

Display complete MIME messages and compose replies with protected attachments, or edit MDY documents, through a new experimental @mieweb/ui/artipod entry. Storybook embeds synthetic plain, HTML-only, nested/Unicode MIME and CID-image examples plus hardcoded MDY; no IMAP server or mail account is needed. Send prepares message bytes and a separate recipient envelope for inspection without transmitting mail.

The host owns a protected Artipod StorageSession, authorization, draft identities, and canonical Y.Doc. Each editor borrows its own Kerebron body binding. Shared Views demonstrates live editing, independent hide/show, and lock/unlock. Draft save persists the exact captured Yjs snapshot and immutable attachment references; reopen restores protected OPFS data. MIME previews sanitize HTML, block outside URLs, and resolve authorized CID/Content-Location parts through revocable blob leases. Delivery omits Bcc headers.

Refs #755; phased plan, setup and test steps. Dependencies: mieweb/kerebron#164 and mieweb/artipod#148 (which builds on mieweb/artipod#130). This is an additive MVP checkpoint; existing editor components are unchanged.

Validation:

• All 2,755 unit tests pass, including 34 focused integration/component tests; typecheck, lint, formatting, package build, static Storybook build, and catalog checks pass (seven existing catalog warnings).
• Live browser checks passed email display/CID decoding, Unicode headers/filenames, HTML-only reply quoting, reply/edit/attachment/save/reopen, delivery/Bcc envelope output, MDY front-matter export and full reload, shared edits, sibling detach/remount, lock redaction, phone layout, dark theme, and RTL address isolation.
• Seven functional browser regression cases are authored and discovery/typechecking pass. The CLI Chromium/visual suite was not run because this session requires browser interaction through CUA; manual CUA browser evidence is above. No screenshot baselines were created or updated.

Release gates: upstream APIs are unreleased, so this draft uses locally packed packages via scripts/install-artifact-mvp.mjs; ordinary CI/consumer installs require coordinated published dependencies first. Optional peer ranges are provisional. Objects/messages buffer at 10 MiB; the synthetic demo key service supplies no production authentication. Arbitrary-size streaming, authenticated remote-user transport, 50-field/eSheet scopes and overrides, complete MIME conformance, owner approvals, and migration/deprecation remain later milestones. Do not publish this preview as a completed release.

Hosted preview status: Cloudflare Pages reports a failed build for 8084dac; its GitHub check summary provides no error details. The local builds above use the documented packed upstream dependencies. Treat this as a local Storybook review checkpoint, with hosted build/standard-install validation still open.

[cloudflare-workers-and-pages]

Deploying ui with    Cloudflare Pages

Latest commit:	8084dac
Status:	🚫  Build failed.

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