Rank badges and level equipment; no edge scrolling before the mouse has moved

- Military rank badges instead of level numbers: Lv 2-4 bronze chevrons, Lv 5-7 silver bars,
  Lv 8-9 gold stars, Lv 10 gold star in a wreath; rank names in the unit info (EN/DE)
- Equipment grows with the level: shoulder pieces (bronze/silver/gold), helmets with horns
  (creatures) or plumes (heroes), capes from Lv 7, glowing ring from Lv 9, aura at Lv 10
- Fix: before the first mouse move the pointer counts as (0, 0) and the edge scrolling
  moved the camera at the start and after loading a savegame

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/main.rs

@@ -322,7 +322,9 @@ async fn main() {
     app.game.hints = app.settings.hints;
     let mut inp = Input { ldown: None, rdown: None, rlast: (0.0, 0.0), rdrag: false, mlast: None, minimap_drag: false, tlast: None, touch_world: false, inspect: None };
     let mut touch = TouchInput::new();
-    let mut auto_touch = platform::coarse_pointer(); // automatic mode: touch interface after a touch, desktop after a mouse click
+    let mut auto_touch = platform::coarse_pointer();
+    // until the mouse has really moved its position is (0, 0): no edge scrolling before that
+    let mut mouse_moved = false; // automatic mode: touch interface after a touch, desktop after a mouse click
     let mut autosave_t = 0.0f32;
     let mut cache_t = 0.0f32;
 
@@ -504,7 +506,10 @@ async fn main() {
                 move_cam(pan, 0.0, cam);
             }
             let edge = 6.0;
-            if keys.edge_scroll && !touch_mode && mx >= 0.0 && my >= 0.0 && mx < screen_width() && my < screen_height() {
+            if !mouse_moved && mouse_delta_position() != Vec2::ZERO {
+                mouse_moved = true;
+            }
+            if keys.edge_scroll && mouse_moved && !touch_mode && mx >= 0.0 && my >= 0.0 && mx < screen_width() && my < screen_height() {
                 if mx < edge {
                     move_cam(-pan, 0.0, cam);
                 } else if mx > screen_width() - edge {