Chandler Copeland 6069ae5e06 feat(05-02): install dnd-kit and create FieldPlacer component ...

- Install @dnd-kit/core@^6.3.1 and @dnd-kit/utilities@^3.2.2
- Create FieldPlacer.tsx with DndContext, draggable palette token, droppable PDF zone
- Implements Y-flip coordinate conversion (screenToPdfCoords / pdfToScreenCoords)
- Fetches existing fields from GET /api/documents/[id]/fields on mount
- Persists fields via PUT /api/documents/[id]/fields on every add/remove
- Renders placed fields as absolute-positioned blue-bordered overlays with remove button
- Default field size: 144x36 PDF points (2in x 0.5in at 72 DPI)

2026-03-19 23:59:51 -06:00

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