fix(camera): don't apply PAN_SPEED to pointer drag

[Antamansid]

Problem

PAN_SPEED was applied to both the wheel-driven trackpad swipe (handleTrackpadMove) and the pointer drag (onDragUpdate). Pointer drag covers two cases:

1. Mouse: pressing left button on empty canvas and dragging.
2. Trackpad: single-finger press-and-drag (the OS converts it to a regular pointer drag, not a wheel event).

In both cases the delta passed to camera.move() is the literal cursor displacement (event.pageX - lastDragEvent.pageX). Multiplying it by PAN_SPEED > 1 makes the canvas slide out from under the pointer — the cursor and the grabbed point stop tracking 1:1.

Two-finger trackpad swipes go through wheel events with abstract deltaX/deltaY units, so a multiplier there is meaningful and stays.

Fix

• Camera.onDragUpdate: drop the PAN_SPEED multiplier; pointer drag now tracks the cursor 1:1 regardless of PAN_SPEED.
• handleTrackpadMove: unchanged — still scales wheel deltas by PAN_SPEED.
• Updated PAN_SPEED JSDoc in graphConfig.ts to reflect the new semantics (trackpad swipe / wheel scroll only, not pointer drag).

Summary by Sourcery

Ensure camera pointer drag pans the scene 1:1 with cursor movement instead of being affected by the configurable pan speed multiplier.

Bug Fixes:

• Stop applying PAN_SPEED to pointer-based camera dragging so the grabbed point stays aligned with the cursor.

Documentation:

• Clarify PAN_SPEED documentation to specify that it only affects wheel and two-finger trackpad swipe panning, not pointer drag.

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Removes the PAN_SPEED multiplier from pointer-drag camera movement so that drag panning tracks the cursor 1:1, while keeping PAN_SPEED semantics for wheel/trackpad swipe and updating the PAN_SPEED documentation accordingly.

File-Level Changes

Change	Details	Files
Stop applying PAN_SPEED to pointer-drag-based camera panning and document that PAN_SPEED only affects wheel/trackpad swipe deltas.	In Camera.onDragUpdate, remove reading PAN_SPEED from context and call camera.move() with the raw pageX/pageY deltas so pointer drag maps 1:1 to cursor movement. Add an explanatory inline comment in onDragUpdate clarifying that PAN_SPEED is intentionally not used for pointer drag and is reserved for wheel-delta-driven trackpad swipes. Update the PAN_SPEED JSDoc in graphConfig.ts to specify that it only scales trackpad two-finger swipe and mouse-wheel scroll panning, not pointer drag, and clarify what it does not affect (auto-panning and zoom).	src/services/camera/Camera.ts src/graphConfig.ts

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