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Weather type and intensity are already tracked from SMSG_WEATHER, but only an icon was shown next to the zone name. This adds a fullscreen ImDrawList overlay that renders: - Rain (type 1): diagonal rain streaks proportional to intensity - Snow (type 2): gently swaying snowflakes with two-tone highlight - Storm (type 3): heavy rain + dark fog-vignette on screen edges Particles wrap at screen boundaries and are re-seeded on type or resolution change. Delta time is capped at 50 ms to prevent teleporting after focus loss. No heap allocations at runtime (static local arrays).