feat: update infinite ammo color to a brighter indigo for better visibility

src/hud.js

@@ -83,7 +83,7 @@ export function updateHUD() {
   // Powerup chips next to health
   const active = [];
   if (G.weapon.rofBuffTimer > 0) active.push({ id: 'accelerator', name: 'ACCELERATE', color: 0xffd84d, time: G.weapon.rofBuffTimer });
-  if (G.weapon.infiniteAmmoTimer > 0) active.push({ id: 'infinite', name: 'INFINITE AMMO', color: 0x4b0082, time: G.weapon.infiniteAmmoTimer });
+  if (G.weapon.infiniteAmmoTimer > 0) active.push({ id: 'infinite', name: 'INFINITE AMMO', color: 0x6366f1, time: G.weapon.infiniteAmmoTimer });
   const key = active.map(a => a.id).join(',');
   if (key !== HUD.last.powerupsKey) {
     HUD.last.powerupsKey = key;

src/pickups.js

@@ -107,7 +107,7 @@ function makeAcceleratorMesh() {
 }
 
 // Infinite ammo (indigo bullet) shared resources
-const INF_COLOR = 0x4b0082; // indigo
+const INF_COLOR = 0x6366f1; // brighter indigo
 
 function makeInfiniteAmmoMesh() {
   const g = new THREE.Group();

src/weapon.js

@@ -277,7 +277,7 @@ export function updateWeapon(delta) {
       const m = mats[i];
       if (!m || !m.isMaterial) continue;
       // Indigo for infinite ammo, yellow for accelerator
-      const color = (G.weapon.infiniteAmmoTimer > 0) ? 0x4b0082 : 0xffd84d;
+      const color = (G.weapon.infiniteAmmoTimer > 0) ? 0x6366f1 : 0xffd84d;
       if (m.emissive) m.emissive.setHex(color);
       if ('emissiveIntensity' in m) m.emissiveIntensity = 0.8 + pulse * 0.6;
     }