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gsxdsm 47087342fc FN-8605: harden tablet touch window controls

Make shared floating dashboard windows reliably movable and resizable on tablet touch viewports.

- Apply a tablet-aware 44px drag and resize hit-target contract to FloatingWindow.
- Preserve phone full-screen sheets below 768px while retaining desktop-hybrid geometry.
- Add geometry, browser touch, and viewport boundary coverage with captured visual evidence.
- Document the shared modal touch contract and release the dashboard fix.

Files changed:
 .changeset/fn-8605-floating-window-touch.md        |   7 ++
 docs/dashboard-guide.md                            |   5 +
 docs/testing.md                                    |   2 +-
 .../dashboard/app/components/FloatingWindow.css    | 116 ++++++++++++++----
 .../dashboard/app/components/FloatingWindow.tsx    |  56 ++++++++-
 .../components/__tests__/FloatingWindow.test.tsx   |  80 +++---------
 .../FloatingWindow.touch-geometry.test.tsx         | 136 +++++++++++++++++++++
 .../FloatingWindowStack.cross-type.test.tsx        |   2 +-
 .../app/hooks/__tests__/useViewportMode.test.ts    |  18 ++-
 packages/dashboard/app/hooks/useViewportMode.ts    |   7 +-
 .../app/task-modal-touch-resize-e2e-fixture.tsx    |  39 +++++-
 .../__screenshots__/fn-8605/phone-fullscreen.png   | Bin 0 -> 11393 bytes
 .../e2e/__screenshots__/fn-8605/tablet-after.png   | Bin 0 -> 14275 bytes
 .../e2e/__screenshots__/fn-8605/tablet-before.png  | Bin 0 -> 14308 bytes
 .../task-modal-touch-resize-browser.test.ts        |  83 +++++++++++++
 15 files changed, 453 insertions(+), 98 deletions(-)

Fusion-Task-Id: FN-8605

Fusion-Task-Lineage: 993c7ed8-c3e9-4673-b0b7-5c50746991a7

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

2026-07-26 12:51:39 -07:00