[#31] Gestures: jitter filter, edge rubber-band, pinch-to-zoom - #98
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GestureFilter passes precise deltas bit-exact (1:1 sync, glide cancel from displayed offset) and quantizes classic-wheel jitter to whole points with lossless residue. Bound residual becomes a capped, decaying EdgeSpring overshoot translated per-frame. Pinch tiers into x1.25 steps (smart double-tap toggles 100/150%). Momentum phases flow as before. Closes #31.
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Closes #31. GestureFilter (viewport.zig, first in onScroll): precise trackpad/Magic Mouse deltas pass bit-exact so 1:1 sync and glide-cancel-from-displayed-offset are preserved; classic non-precise jitter accumulates fractional residue and emits whole points (no shimmer, no lost motion; absorbed zeros reset the scroll lock like a lifted gesture). Clamped-away scroll at a document bound becomes a capped (48px) EdgeSpring overshoot, translated per frame in drawRect, decaying with full redraws until the timer parks at exactly zero. Pinch: magnifyWithEvent forwards deltas (0.0 skipped), Zig PinchState tiers them into x1.25 zoom steps with residue; smartMagnifyWithEvent double-tap toggles 100%/150% via reserved 0.0. Momentum/inertia phases flow through the existing path unchanged.
Evidence: zig build test -Doptimize=ReleaseFast --summary all green (144/144; 4 new: filter quantize/passthrough, mid-glide cancel, spring cap/decay/settle, pinch tiers). Ship binary 176472 B (<180 KiB). Screenshots regenerated, no visual diff.
Overlap note: pinch zoom here is standalone (17.0 x factor); #30 (PR #97) owns the class-aware TextScale — merge keeps #30's scale and routes these tier steps through it.
Verification limits: AppKit gesture/rubber-band paths compile in both binaries but need windowed trackpad testing; behavior pinned via GestureFilter/EdgeSpring/PinchState contract tests.