feat(toolbar): switch tool icons to embedded SVGs

[Noah4ever]

I use Wayscriber quite a bit and really enjoy it. It has become part of my regular workflow.

One thing that always stood out to me though were the toolbar icons. Maybe because I am more a frontend dev than backend. They’re functionally fine, but visually they felt a bit inconsistent compared to the rest of the UI.

The existing Cairo paths clearly took time and care to get right. For consistency and maintainability, though, I think using SVG assets is a cleaner long-term approach.

This PR replaces the procedural Cairo-drawn tool icons with Lucide SVG icons rendered via resvg, aiming for a cleaner and more consistent look while keeping behavior exactly the same.

What I changed

• Added a small SVG rendering module for toolbar icons
  • lazy SVG parsing
  • per-size raster cache
  • Cairo mask-based painting so icons inherit the current UI color
• Updated toolbar_icons/tools.rs to use the SVG renderer
• Added resvg and tiny-skia as dependencies
• Kept all existing draw_icon_* function signatures unchanged to avoid refactoring call sites

Before

After

The icons can obviously be changed anytime (in assets/icons/)

cargo test passes locally

Happy to adjust anything if this doesn’t align with the project direction. I mainly wanted to improve visual consistency without touching behavior or APIs.

[devmobasa]

The icons and design all over the app is something I am not proud of.
This is great. I like this. Thanks!

These look much better, and I love option to easily replace them outside of the code, as it should be.

[devmobasa]

One thing that always stood out to me though were the toolbar icons. Maybe because I am more a frontend dev than backend. They’re functionally fine, but visually they felt a bit inconsistent compared to the rest of the UI.

Yeah, perhaps, I am more of a backend person, I don't have an eye for these things :)
I appreciate the effort.

If you have any other ideas in regards to UI/UX, or anything else feel free to open PR or an issue.