Remember visualizer manual layout.

[igalklebanov]

Hey 👋

Brought up by @SenorLawyer on Discord.

Currently you play with the boxes, cluster them, make it look noiiceee, ya feel me? But after exiting the visualizer, next time you come back, you have to do it all over again.

Let's make Studio remember the last layout.

[sorenbs]

It will now remember the layout while Studio is open. As a future iteration, we could persist in local storage. Please see: #1455

[sorenbs]

Hey @igalklebanov 👋 Implemented in #1555 — manual layouts now persist in localStorage (keyed per schema, merged over ELK auto-layout on load, so new tables still get auto-placed), and the existing "Reset layout" button clears the saved layout. Tell @SenorLawyer the clusters will stay noiiice across reloads. 🎨