Paint by face concept#21378
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Introduce a FACE brush shape and implement painting/preview logic that targets whole visual faces instead of individual triangles. Adds Shape.FACE enum and two helpers: _getCoplanarConnectedFaces (flood-fill neighbor faces by normal similarity, default angle_threshold 0.99) and _getUvAreasForFace (collects UV polygons for all connected coplanar triangles, scales by texture dimensions). Integrates face-mode in event handling so the cursor and painting operations use the full face UV areas; falls back to existing stroke-based behavior for other brush shapes and handles missing UVs or mesh data gracefully.
Introduce a new BrushShapeButton for the Face brush (Cura.PaintToolBrush.FACE) with icon and localized label. Disable the "Brush Size" label and slider when the selected BrushShape is FACE, since size is not applicable for this brush.
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Replace list-based flood-fill with collections.deque for O(1) pops, using popleft() to traverse connected faces. Add a brush-size -> angle_threshold mapping and pass it into _getCoplanarConnectedFaces so brush size controls coplanarity. Optimize neighbor enqueueing with deque.extend and tighten docstrings. Simplify UV polygon collection by skipping None coords, building/scaling UV arrays, and collecting Polygons. In QML, remove the disabled condition on the shape size slider so it is always enabled. These changes improve traversal performance and make face selection responsive to brush size.
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Proof of concept for paint by face
Requires Ultimaker/libUvula#9