Zoom is normalised to the whole tree, so z=3 still renders a wide tree too
small on a phone. Raise the ceiling to 10 (revises OQ-001); SVG stays crisp at
any zoom so a generous max is harmless.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Move the pinch-zoom (pinchZoom) and inertia-step (stepInertia) geometry out of
the panZoomGestures DOM glue into pure, unit-tested helpers in panZoom.ts, with
named FRAME_MS/INERTIA_* constants. Addresses the QA blocker that the gesture
module's core math was untested. No behaviour change.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Pan rounded to 2 decimals, zoom to 3, so ?cx/?cy/?z no longer carry float
noise like cx=457.8300882631206.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
A fresh visit (no URL state) now opens at INITIAL_VIEW (z=3) so node tiles and
generation labels are legible on arrival; the fit-to-screen control still zooms
out to the whole tree (DEFAULT_VIEW, z=1). Shared links with ?z still win.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
The #361 layout ADR already owns 026; renumber the custom-viewBox pan/zoom ADR
to 027 and update the glossary + panZoom.ts references (Elicit review).
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Fit-to-screen tweens to the default view over 300ms via animateView (eased,
lerpView-driven) and snaps instantly when prefers-reduced-motion is set
(US-PAN-004 AC2, NFR-A11Y-003).
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Add a panZoomGestures action: one-finger/left-button drag pans, two-finger
pinch and Ctrl+wheel zoom around the centroid, plain wheel pans. Pan is
edge-clamped via clampPan (no infinite scroll), a real drag suppresses the
trailing node click, and inertia decays after release unless prefers-reduced-
motion. Canvas container switches from native scroll to overflow-hidden.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Replace the scalar zoom prop with a {x,y,z} PanZoomState. The viewBox centre
is offset by the pan and width/height scaled by zoom; the default {0,0,1}
frames the whole tree (fit-to-screen). Page header buttons now step view.z
through clampZoom over the resolved 0.25–3.0 range.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Degrade Infinity/NaN/overflow per axis and clamp zoom into bounds so a crafted
?cx/?cy/?z shared link cannot blank the SVG (Nora's review).
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
