fix: align k-space zoom and pan with camera axes - #20
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Issue: k-space wheel zoom and pan used screen-space approximations that only matched the XY view. On high-DPI displays and in XZ/YZ/3D views, zooming around the cursor and middle/right-button panning could drift or move along the wrong world axes. Solution: convert cursor offsets and drag deltas through the same camera-plane to world-space transform used by the k-space projection, then update the view center from that shared coordinate model. Changes: add helpers for wheel zoom scaling, scale clamping, and camera-plane conversion; make wheel zoom preserve the cursor anchor from the target camera state; update mouse and touch pan to use the shared transform; sync animation targets when drag interactions interrupt an in-flight camera transition.
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