Paper space now renders its sheet through the unified shader, the same
path as model space: a full-canvas "sheet" ViewportInstance draws the
layout's own entities + viewport borders + interim/preview wires, with a
camera locked to the top/plan orientation (paper is 2-D and never
orbits). Floating content viewports overlay it.
- PaperCanvas no longer draws entity wires (still paints the desk, sheet
and hatch/wipeout/image fills; full removal is the next step).
- Right-drag on the paper sheet no longer orbits the camera (it would
corrupt the frame and skew subsequent pans).
- Fix floating-viewport orbit oscillation: orbit_active_viewport wrote
view_direction.y negated while camera_for_viewport reads it un-negated,
so each drag step read back a Y-mirrored camera and flipped the model
between a rotation and its opposite every frame. Store eye directly,
matching snap_active_viewport_to_direction and the reader.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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