Replaces the single-line name input with a modal that mirrors the
design-handoff DeployWizard shape (backdrop + violet-bordered panel,
wizard-step tabs, card-picker body):
- Step 1 — TARGET: a RUN LOCALLY card plus one card per enrolled
swarm host. Non-routable hosts render disabled with their status as
the tooltip. Selecting an agent pins the topology via
target_host_uuid; local stays unihost.
- Step 2 — TYPE: BLANK (POST /topologies/blank) or SEED-BASED
(POST /topologies/ with depth, branching, deckies-per-LAN, optional
seed). Name is required on both.
Existing navigate-to-editor-on-create behavior is preserved.
Dragging a LAN or decky, or resizing a NetBox, updates React state
but previously vanished on reload because the grid-layout adapter
rewrote everything from the graph. Add a per-topology localStorage
snapshot (key: mazenet.layout.<topologyId>) that captures net
x/y/w/h and decky x/y; useLayoutPersistor writes it debounced, and
getTopology merges it over adaptTopology's grid so entities without
a stored entry still fall back to a clean auto-layout. Deleting a
topology calls clearLayout to drop its snapshot.
Active/degraded/failed/deploying topologies cannot be deleted
without first transitioning to torn_down, but the UI had no way
to trigger that. Add POST /topologies/{id}/teardown mirroring the
deploy endpoint (background task, 202 Accepted), and a
click-to-arm TEARDOWN button on the topology list card that shows
whenever the row is in a teardown-eligible state.
