gsxdsm 504b0f8b04 FN-7914: fix mobile prompt fullscreen editor Expand button hidden behind workflow sheet ...

Fixes the workflow editor's fullscreen prompt overlay having an inert-looking mobile Expand button because a static z-index of 10000 sat below the mobile workflow editor's full-screen FloatingWindow sheet (10100+ shared floating-stack band).

- Have the fullscreen prompt overlay claim a fresh shared floating-stack z-index via nextFloatingZ() when opened, instead of relying on the static CSS z-index: 10000 fallback
- Track the claimed z-index in new promptFullscreenZ state, applying it as an inline style on the portaled overlay and clearing it on collapse/Escape
- Update FNXC comments in WorkflowNodeEditor.css and floatingWindowStack.ts documenting the shared z-index contract and why the static value is now only a fallback
- Add regression tests asserting the prompt fullscreen overlay's z-index exceeds the workflow editor's floating window z-index on desktop, mobile prompt nodes, mobile gate nodes, and after re-opening after collapse

Files changed:
 .../app/components/WorkflowNodeEditor.css          |  1 +
 .../app/components/WorkflowNodeEditor.tsx          | 25 ++++++-
 .../__tests__/WorkflowNodeEditor.test.tsx          | 81 ++++++++++++++++++++++
 .../app/components/floatingWindowStack.ts          |  2 +-
 4 files changed, 106 insertions(+), 3 deletions(-)

Fusion-Task-Id: FN-7914

Fusion-Task-Lineage: e230309a-3b53-4e42-9e63-7516597b6c24

Co-authored-by: Fusion (runfusion.ai) <noreply@runfusion.ai>

2026-07-12 22:15:48 -07:00

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