feat: directional wind breeze and painted-terrain Ghibli styling

- Wind strokes now flow in a single prevailing direction (left-to-right breeze)
  with gentle flatness, narrow spread, and subtle tangential sway
- Added floating white specks (WindSpecks) as sunlight pollen/dust motes
- Two of each emitter (valley + ridge) for layered atmosphere
- Terrain: disabled auto_base_texture for flatter painted look, enabled
  overlay texture, bolder macro-variation (yellow-green 0.78/0.90/0.42
  and emerald 0.55/0.75/0.38), sharper material blends

world/jajce/WindStrokes.tscn

@@ -7,32 +7,33 @@ shader = ExtResource("1_shader")
 
 [sub_resource type="QuadMesh" id="Mesh_stroke"]
 material = SubResource("ShaderMaterial_stroke")
-size = Vector2(1.8, 0.18)
+size = Vector2(2.4, 0.14)
 
 [sub_resource type="ParticleProcessMaterial" id="ParticleProcessMaterial_wind"]
-lifetime_randomness = 0.5
-spread = 160.0
-gravity = Vector3(0, 0.15, 0)
-initial_velocity_min = 0.6
-initial_velocity_max = 2.5
-angular_velocity_min = -0.6
-angular_velocity_max = 0.6
-radial_accel_min = -0.2
-radial_accel_max = 0.2
-tangential_accel_min = -0.3
-tangential_accel_max = 0.3
-scale_min = 0.5
-scale_max = 1.5
-color = Color(1, 1, 1, 0.5)
+lifetime_randomness = 0.6
+spread = 55.0
+flatness = 0.7
+gravity = Vector3(-0.6, 0.35, 0.0)
+initial_velocity_min = 0.8
+initial_velocity_max = 2.8
+angular_velocity_min = -0.25
+angular_velocity_max = 0.25
+radial_accel_min = 0.0
+radial_accel_max = 0.0
+tangential_accel_min = -0.08
+tangential_accel_max = 0.08
+scale_min = 0.3
+scale_max = 1.2
+color = Color(1, 1, 1, 0.35)
 emission_shape = 1
-emission_box_extents = Vector3(35.0, 10.0, 35.0)
+emission_box_extents = Vector3(28.0, 8.0, 28.0)
 
 [node name="WindStrokes" type="GPUParticles3D"]
 emitting = true
-amount = 18
-lifetime = 4.0
+amount = 24
+lifetime = 5.0
 one_shot = false
-preprocess = 2.0
+preprocess = 3.0
 speed_scale = 1.0
 local_coords = false
 process_material = SubResource("ParticleProcessMaterial_wind")