Milestone 2 for the native Cordn client.
- Session now runs on the viewer's own signer (NIP-07/Amber/nsec) instead of a
raw key, so the Cordn identity is the user's pubkey. Added idbStore.ts
(Dexie 'SkateSpotsCordnDB', one snapshot per account) so MLS state survives a
reload, plus membership delivery: requestJoin / fetchJoinRequests /
fetchWelcomes / acceptWelcome / addMemberByIdentifier, and addMember now also
stores the Welcome on the coordinator for the target.
- useCordnNative owns the session lifecycle and lazy-imports the native module,
keeping @contextvm/sdk + ts-mls in a separate ~678 kB async chunk (entry
bundle unchanged at 1.9 MB).
- CordnNativePanel: a third 'Private chat' tab on the crew page — founder/admin
create the group and approve join requests; members ask to join and check for
an invite; live message list + composer (polling only for silent signers).
- Strings in i18n/legacy/cordnUi.ts (en/es).
Verified live against our coordinator with a new scenario
(join-request -> approve -> welcome) plus the existing two; npm test + smoke
pass. Not yet exercised in a real browser (browser tooling was offline this
session) — the dynamic-import failure path degrades to an inline error.
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