fix(camera): make wheel zoom steps reciprocal

[draedful]

Summary

The previous wheel zoom formula used currentScale * (1 - dScale). Equal zoom-in and zoom-out wheel steps therefore used (1 + d) and (1 - d) factors and did not return to the original scale.

This changes wheel zoom to apply the signed delta in log-scale space with currentScale * exp(-dScale). Relative zoom speed remains configurable through SPEED and STEP, while opposite steps become reciprocal.

Changes

• use an exponential scale multiplier in Camera.handleZoom;
• document the relative/log-scale semantics of SPEED and STEP;
• add an E2E regression test for equal zoom-in and zoom-out steps.

Validation

• npm run lint
• npm run test:unit -- --runInBand
• npm run test:e2e -- camera-control.spec.ts — 7 passed
• npm run e2e:build
• Prettier check and git diff --check

Summary by Sourcery

Make wheel zoom steps reciprocal by applying camera scale changes in log-scale space.

Bug Fixes:

• Make equal wheel zoom-in and zoom-out steps return the camera to its original scale.

Enhancements:

• Define camera zoom speed and step settings in relative/log-scale terms and apply zoom changes consistently across scales.

Documentation:

• Document the relative zoom speed and log-scale step semantics for camera settings.

Tests:

• Add an end-to-end regression test covering reversible equal zoom steps.

[sourcery-ai]

Reviewer's Guide

Wheel zoom now applies signed deltas in log-scale space via an exponential multiplier, so equal opposite wheel steps return to the original scale while SPEED and STEP remain configurable. The configuration documentation is updated and an E2E regression test verifies reversibility.

File-Level Changes

Change	Details	Files
Replace linear wheel-scale adjustment with a log-scale exponential multiplier to make opposite zoom steps reciprocal.	Compute the next camera scale as the current scale multiplied by exp(-dScale). Retain configurable relative zoom behavior through SPEED and STEP while preserving wheel direction handling.	src/services/camera/Camera.ts
Clarify the zoom configuration contract to describe relative and log-scale semantics.	Document SPEED as a relative zoom-speed multiplier. Document STEP as the base log-scale zoom increment and reciprocal-step behavior. Update the settings reference and camera constant type comments.	src/graphConfig.ts docs/system/graph-settings.md
Add end-to-end coverage for reversible equal wheel zoom steps.	Zoom to a known scale, apply equal zoom-in and zoom-out wheel deltas, and verify the original scale is restored.	e2e/tests/camera-control.spec.ts

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[sourcery-ai]

Hey - I've reviewed your changes and they look great!

Sourcery assessment

Approved.

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