feat: starvation balance rework and Ghibli wind-stroke visuals

- Reduce hunger rate to 0.125/tick (~25/day) for ~6-7 day death timeline
- Slow energy drain: idle 0.125, travel 0.5, work 0.5, complete 0.0625/tick
- Use exact binary fractions for all rates to preserve float precision in save/load
- Starving/critically-hungry NPCs always override sleep to seek food first
- Extend starvation death threshold from 20 to 600 ticks (~3 days of starvation)
- Add calligraphy-style wind stroke particles (WindStrokes scene + shader)
- Two wind stroke emitters in valley and ridge for Ghibli atmosphere
- Rework terrain macro-variation colors for vibrant warm-green palette
- Enhance environment: stronger glow/bloom, higher saturation, warmer sky/fog/ambient

world/jajce/materials/wind_stroke.gdshader

@@ -0,0 +1,14 @@
+shader_type spatial;
+render_mode blend_mix, depth_draw_opaque, cull_disabled, unshaded;
+
+uniform float softness : hint_range(0.0, 1.0) = 0.45;
+uniform vec3 tint : source_color = vec3(0.95, 0.93, 0.88);
+
+void fragment() {
+	float edge_dist = abs(UV.y - 0.5) * 2.0;
+	float alpha = 1.0 - smoothstep(0.0, 1.0, edge_dist);
+	alpha *= smoothstep(0.0, 0.2, UV.x) * smoothstep(0.0, 0.2, 1.0 - UV.x);
+	alpha *= softness * 0.35;
+	ALBEDO = tint;
+	ALPHA = alpha;
+}