Users can now define multiple named layouts of the workbench homepage and
switch between them. Each scene holds its own openApps list with per-app
window state (minimized / maximized / size). Scene list syncs cross-device
via mana-sync; the active scene id is per-device (localStorage) so device
A doesn't pull device B into a different scene.
- new `workbenchScenes` Dexie table, registered in manaCoreConfig
- `workbenchScenesStore` (Dexie liveQuery) with scene CRUD + per-scene app
mutations; auto-seeds a default "Home" scene on first run
- SceneTabs pill bar above the carousel with dnd reorder + context menu
(rename / duplicate / delete); SceneRenameDialog and a reusable
ConfirmDialog for the destructive path
- workbench +page.svelte refactored to delegate all openApps mutations to
the store; the carousel itself is unchanged
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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