Startup database restore pins the window but never sets the gRPC routing database #3058

Problem

On launch, databaseStore.load() (packages/desktop-app/src/lib/stores/database.svelte.ts) picks a database: the tray-requested one, then the remembered one, then the daemon default. It calls pin_window_database and activateProSync with that id, but never set_active_database. The only set_active_database call is in switchTo(), and nothing on the Rust side sets it at startup either.

So when the restored database is not the daemon default (a remembered selection, or a tray pick), the window pin and the switcher show database X, while GrpcClient.active_database_id stays None. Node, import, embeddings, agent-session and local-agent requests go out with no x-ns-database-id header and reach the daemon's default database. The node-event watcher also watches the default database. This lasts until the user switches databases by hand.

Repro

1. Register two databases, A (default) and B.
2. Switch to B, then quit and relaunch.
3. The switcher shows B, but reads and writes go to A.

Suggested fix

Have load() also invoke set_active_database(resolved), or merge "pin window" and "set routing database" into one command so the two can't drift apart.

Found while reviewing PR #3056. Import progress still arrives in this state, because an unrouted (None) event goes to the focused window.