Foundation + Instant Shell for IndexedDB Admin Caching

[bhubbard]

What this achieves:

• On repeat visits, the admin shell renders instantly (sidebar, header, navigation) from cached manifest data
• The currentUser is also cached, so permission-dependent UI renders immediately
• Background fetches update the cache transparently
• If IndexedDB is unavailable (private browsing), everything degrades gracefully to standard useQuery

Next phases (not yet implemented):

• Phase 2: Cache content lists, media, users, bylines, taxonomies, menus, sections
• Phase 3: Optimistic mutations with conflict resolution
• Phase 4: Delta sync, sync status indicator, "Clear cache" button

[changeset-bot]

⚠️ No Changeset found

Latest commit: e97af39

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

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[github-actions]

All contributors have signed the CLA ✍️ ✅
_{Posted by the CLA Assistant Lite bot.}

[bhubbard]

I have read the CLA Document and I hereby sign the CLA

[bhubbard]

recheck

[bhubbard]

All 4 phases from the plan are complete:

Phase 1: Foundation + Instant Shell ✅ — IDB schema, cache-store, useCachedQuery, warmup, CacheProvider
Phase 2: Entity Caching ✅ — All major list/detail views cached (content, media, menus, sections, taxonomies, bylines, users)
Phase 3: Optimistic Mutations ✅ — optimisticDelete, optimisticUpdate, optimisticListItemUpdate helpers, applied to content/media/menu/section deletes and publish/unpublish
Phase 4: Delta Sync + Polish ✅ — Background sync manager, multi-tab BroadcastChannel, sync indicator in header, "Clear Local Cache" in settings

[github-actions]

Overlapping PRs

This PR modifies files that are also changed by other open PRs:

• feat(admin): add Lingui i18n infrastructure #234 (11 shared files)

This may cause merge conflicts or duplicated work. A maintainer will coordinate.

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commit: e97af39

[BenjaminPrice]

This is a large PR. Could you please update the PR description to reflect the state of the PR (all phases completed, as per your comment) and use the template provided?

https://github.com/emdash-cms/emdash/blob/main/.github/PULL_REQUEST_TEMPLATE.md