Clear multi-level indicators and smoother zoom controls

This update brings a clearer way to understand multi-level features by adding dot indicators that light up only when active, helping you see at a glance where you are in a sequence. The active states now have sharper contrast, turning black when selected and white when reset, so the status is unmistakable.

**Improved zoom experience and panel tweaks**
Page zooming has been refined to feel smoother and avoid compounding effects by adjusting the zoom approach. We've also tidied up the widget panel's positioning to naturally appear on the opposite side for better balance, and the cursor reacts instantly, making your interactions feel more responsive.

Additional polish includes making sure background images hide properly when you opt to hide them, simplifying available zoom levels for consistency, and fixing the reset button’s hover state to always respond correctly. Together, these improvements make navigating and using your tools more intuitive and visually clear.