Improve canvas panning UX in Modeler
>>> [!note] Migrated issue <!-- Drupal.org comment --> <!-- Migrated from issue #3577198. --> Reported by: [lauriii](https://www.drupal.org/user/1078742) >>> <h3 id="summary-problem-motivation">Problem/Motivation</h3> <p>Navigating around the Modeler canvas is awkward. Currently the only effective way to move within the canvas is to zoom in or out. Standard pan interactions (e.g., click-and-drag on empty canvas, middle-mouse-button drag, or trackpad two-finger scroll) either do not work as expected or are not discoverable. This makes working with larger workflows frustrating.</p> <h4 id="summary-steps-reproduce">Steps to reproduce</h4> <h3 id="summary-proposed-resolution">Proposed resolution</h3> <p>Implement standard canvas panning interactions: click-and-drag on empty canvas space to pan, middle-mouse-button drag, and two-finger trackpad scroll. Ensure these behave consistently with common diagramming tools so the interactions feel familiar to users. Review zoom behavior to ensure it complements rather than substitutes for panning.</p> <h3 id="summary-remaining-tasks">Remaining tasks</h3> <h3 id="summary-ui-changes">User interface changes</h3> <h3 id="summary-api-changes">API changes</h3> <h3 id="summary-data-model-changes">Data model changes</h3>
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