Update egui to 0.26.2

[white-axe]

Connections

• Closes #107

Description This updates egui, eframe, egui-wgpu and so on from 0.25.0 to 0.26.2.

Testing I checked briefly that the map editor, database editors and archive manager still work on native and web. Also I can confirm that #107 is fixed now. egui 0.26 added a section to the egui inspection window that shows which parts of the code are causing repaints, which is quite handy.

Checklist

• [x] Run cargo fmt.
• [x] Run cargo clippy. If applicable, add:
  • [x] --target wasm32-unknown-unknown
• [x] Run cargo build --release
• [x] If applicable, run trunk build --release