emil28092005 29a58d204b feat: ImGui shadow parameters panel with clipboard copy ...

- Push constant block expanded: 160B → 176B (added vec4 shadowParams)
- shadowParams: x=bias, y=sampleRadius, z=farPlane, w=unused
- Fragment shader: bias and sampleRadius now read from push constants
  (dynamic, adjustable at runtime)
- Shadow.frag: uses pc.shadowParams.z for farPlane (dynamic)
- Slope-dependent bias: bias + bias*2*(1-NdotL) — adaptive
- VulkanRenderer: public ShadowBias, ShadowSampleRadius, ShadowFarPlane properties
- Program.cs: ImGui 'Shadow Parameters' panel with sliders:
  - Light Intensity (0-100), Range (5-100), RGB color
  - Shadow Bias (0.001-0.5), Sample Radius (0.001-0.1), Far Plane (10-120)
  - 'Copy Parameters to Clipboard' button — outputs all values as text
- 227 tests, all pass

2026-06-18 21:48:38 +03:00

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