fix(drawing): Arrow keys visually pan canvas intuitively #356

[afrdbaig7]

fixes #356
This PR fixes the unintuitive arrow key behavior in drawing mode, where pressing a direction key resulted in movement opposite to what users expect. The issue was caused by directly modifying the origin coordinates, which inverted the perceived direction of movement on screen. With this change, arrow key input now follows standard visual direction semantics—pressing left moves the content left, right moves it right, up moves it up, and down moves it down—bringing the behavior in line with common graphics tools like Inkscape. In addition to correcting the direction mapping, the fast movement functions have been refactored using a scaling helper to remove duplication and ensure consistent behavior. A centralized movement helper was also introduced to make the logic easier to maintain and extend in the future. The changes have been tested across normal and fast movement, different zoom levels, and continuous key presses, and verified to be consistent with mouse drag interactions. No regressions were observed in object manipulation, selection movement, or undo/redo functionality. The scope of this change is limited to drawing mode and does not affect the underlying coordinate system, making the overall risk low while significantly improving usability and consistency