chore(conductor): Add new track 'Frosted Glass Background Effect'

conductor/tracks/frosted_glass_20260313/spec.md

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+# Specification: Frosted Glass Background Effect
+
+## Overview
+Implement a high-fidelity "frosted glass" (acrylic) background effect for all GUI panels and popups within the Manual Slop interface. This effect will use a GPU-resident shader to blur the content behind active windows, improving readability and visual depth while preventing background text from clashing with foreground UI elements.
+
+## Functional Requirements
+- **GPU-Accelerated Blur:**
+  - Implement a GLSL fragment shader (e.g., Gaussian or Kawase blur) within the existing `ShaderManager` pipeline.
+  - The shader must sample the current frame buffer background and render a blurred version behind the active window's background.
+- **Global Integration:**
+  - The effect must automatically apply to all standard ImGui panels and popups.
+  - Integrate with `imgui.begin()` and `imgui.begin_popup()` (or via a reusable wrapper helper).
+- **Real-Time Tuning:**
+  - Add controls to the **Live Shader Editor** to adjust the following parameters:
+    - **Blur Radius:** Control the intensity of the Gaussian blur.
+    - **Tint Intensity:** Control the strength of the "frost" overlay color.
+    - **Base Opacity:** Control the overall transparency of the frosted layer.
+- **Persistence:**
+  - Save frosted glass parameters to `config.toml` under the `theme` or `shader` section.
+
+## Technical Implementation
+- **Shader Pipeline:** Use `PyOpenGL` to manage a dedicated background texture/FBO for sampling.
+- **Coordinate Mapping:** Ensure the blur shader correctly maps screen coordinates to the region behind the current ImGui window.
+- **State Integration:** Store tuning parameters in `App.shader_uniforms` and ensure they are updated every frame.
+
+## Acceptance Criteria
+- [ ] Panels and popups have a distinct, blurred background that clearly separates them from the content behind them.
+- [ ] Changing the "Blur Radius" slider in the Shader Editor immediately updates the visual frostiness.
+- [ ] The effect remains stable during window dragging and resizing.
+- [ ] No significant performance degradation (maintaining target FPS).
+
+## Out of Scope
+- Implementing different blur types (e.g., motion blur, radial blur).
+- Per-panel unique blur settings (initially global only).