Implement WoW 3.3.5a DBC-driven lighting system

Add complete Blizzard-style time-of-day lighting pipeline:

Spatial Volume System (Light.dbc):
- Light volumes with position + inner/outer radius
- Distance-based weighting with smoothstep falloff
- Multi-volume blending (top 2 with normalized weights)
- X,Z,Y coordinate handling + LIGHT_COORD_SCALE for ×36 quirk
- Smooth zone transitions without popping

Profile Selection (LightParams.dbc):
- Weather variants: clear/rain/underwater
- Links to 18 color + 6 float band curves per profile
- Block indexing: LightParamsID × 18/6 + channel

Time-of-Day Band Sampling (LightIntBand/LightFloatBand):
- Half-minutes format (0-2879) with time clamping
- Keyframe interpolation with midnight wrap
- Wrap-safe initialization for edge cases
- BGR color unpacking

Multi-Volume Blending:
- Weighted sum of all lighting params
- Proper direction blending: normalize(sum(dir × weight))
- Blends ambient, diffuse, fog, sky, cloud density

Temporal Smoothing:
- Exponential blend to prevent frame snapping
- Smooths ALL parameters (colors, fog, direction, sky)

Game Time Support:
- Accepts server-sent game time (WoW standard)
- Falls back to local time if not provided
- Manual override for testing

Debug Features:
- Volume distance/weight logging
- Fog params logging
- Coordinate scale verification

Also: Move buff bar to top-left under player frame

CMakeLists.txt

@@ -142,6 +142,7 @@ set(WOWEE_SOURCES
     src/rendering/lens_flare.cpp
     src/rendering/weather.cpp
     src/rendering/lightning.cpp
+    src/rendering/lighting_manager.cpp
     src/rendering/character_renderer.cpp
     src/rendering/character_preview.cpp
     src/rendering/wmo_renderer.cpp