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/gfx.rs

@@ -1183,6 +1183,63 @@ impl Gfx {
         s.chars().count() as f32 * GW * scale
     }
 
+    // Military rank badge for a level (k = size of one badge pixel in device pixels):
+    // Lv 2-4: 1-3 bronze chevrons, Lv 5-7: 1-3 silver bars, Lv 8-9: 1-2 gold stars,
+    // Lv 10: a gold star in a green wreath. Lv 1 has none. Returns the width drawn.
+    pub fn badge(&self, x: f32, y: f32, level: u32, k: f32) -> f32 {
+        let px = |gx: i32, gy: i32, c: Color| draw_rectangle(x + gx as f32 * k, y + gy as f32 * k, k, k, c);
+        let plate = |w: i32, h: i32| draw_rectangle(x - k, y - k, (w + 2) as f32 * k, (h + 2) as f32 * k, Color::new(0.05, 0.03, 0.04, 0.85));
+        let bronze = Color::from_rgba(214, 140, 70, 255);
+        let silver = Color::from_rgba(215, 222, 235, 255);
+        let gold = Color::from_rgba(255, 210, 70, 255);
+        let star = |ox: i32, oy: i32, c: Color| {
+            for (gx, gy) in [(2, 0), (1, 1), (2, 1), (3, 1), (0, 2), (1, 2), (2, 2), (3, 2), (4, 2), (1, 3), (2, 3), (3, 3), (0, 4), (1, 4), (3, 4), (4, 4)] {
+                px(ox + gx, oy + gy, c);
+            }
+        };
+        match level {
+            0 | 1 => 0.0,
+            2..=4 => {
+                let n = (level - 1) as i32;
+                plate(5, n * 2 + 1);
+                for c in 0..n {
+                    // a chevron pointing up
+                    for (gx, gy) in [(2, 0), (1, 1), (3, 1), (0, 2), (4, 2)] {
+                        px(gx, c * 2 + gy - if gy == 2 { 1 } else { 0 }, bronze);
+                    }
+                }
+                7.0 * k
+            }
+            5..=7 => {
+                let n = (level - 4) as i32;
+                plate(5, n * 2 - 1);
+                for b in 0..n {
+                    for gx in 0..5 {
+                        px(gx, b * 2, silver);
+                    }
+                }
+                7.0 * k
+            }
+            8 | 9 => {
+                let n = (level - 7) as i32;
+                plate(n * 6 - 1, 5);
+                for s in 0..n {
+                    star(s * 6, 0, gold);
+                }
+                (n * 6 + 1) as f32 * k
+            }
+            _ => {
+                plate(9, 7);
+                let green = Color::from_rgba(90, 170, 80, 255);
+                for (gx, gy) in [(0, 2), (0, 3), (0, 4), (1, 5), (2, 6), (8, 2), (8, 3), (8, 4), (7, 5), (6, 6), (3, 6), (5, 6), (1, 1), (7, 1)] {
+                    px(gx, gy, green);
+                }
+                star(2, 1, gold);
+                11.0 * k
+            }
+        }
+    }
+
     // text with a dark shadow
     pub fn text_sh(&self, s: &str, x: f32, y: f32, scale: f32, color: Color) {
         self.text(s, x + scale, y + scale, scale, Color::new(0.0, 0.0, 0.0, color.a * 0.85));