Make immersive editor drawer have pin/unpin and more responsive to browser sizes/resizing #6318
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Description
…ionality
Enhance the immersive editor drawer with advanced features matching the Expert drawer:
Technical changes:
When drawer is pinned, it becomes part of the flex layout and pushes the iframe editor to the right, allowing both to be visible side-by-side.
Related Issue(s)
#6267
Checklist
flowforge.yml?FlowFuse/helmto update ConfigMap TemplateFlowFuse/CloudProjectto update values for Staging/ProductionLabels
area:migrationlabel