* refactor: share behaviour control roles through dom-css
Code export needs the same control model and layer roles preview islands use. They move from packages/vue to packages/dom-css/src/behaviours as behaviourControls and controlRoles, and the layerPath, findLayerByPath and hasBehaviour helpers they need move from Core down to scene-graph, since dom-css cannot depend on Core. Preview behaves the same.
* fix(scene-graph): escape layer path names and stop on parent cycles
A layer named Wifi#1 or Row/1 did not round-trip through its path, so preview skipped that control or reveal target, and a parent cycle in imported data hung the walk. Names escape % / and #, and the walk goes through closest(), which stops on a cycle.
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