The outline and blocks are no longer tabs: one panel shows the
outline tree, the new-block palette and a search over existing
nodes. Outline rows drag to reorder (same snap engine, explicit
gap targets), palette blocks and searched nodes drop onto the
outline gaps as well as the page.
Named slots (x-graph.connections, e.g. a pdp's info-section /
3d-accessories / model) render as groups under their block with
allowed types, live counts and a slot-limited insert picker.
Drops that fit no plain-children rule resolve to the first
accepting slot; existing nodes link via graft tree.link.
Adds Api.searchNodes, schema connections helpers, handle-aware
controller ops (linkExisting, insertIntoSlot, dropExisting) and
mock support for /api/nodes listing and graft links.
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Co-Authored-By: Codebuff <noreply@codebuff.com>
mats
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