chore(conductor): Add new track 'UI Theme Overhaul & Style System'

conductor/tracks/ui_theme_overhaul_20260308/spec.md

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+# Specification: UI Theme Overhaul & Style System
+
+## Overview
+This track aims to modernize the application's appearance by implementing a professional, high-fidelity UI theme using `imgui-bundle`'s native styling and theming capabilities. It focuses on improving typography, visual shapes, and introducing advanced features like custom shaders, multi-viewport support, and user-managed layout presets.
+
+## Functional Requirements
+- **Professional Typography:**
+    - Replace the default ImGui font with a high-quality, professional font family (e.g., **Inter** or **Maple Mono**).
+    - Implement proper font scaling and anti-aliasing.
+- **Style & Theming System:**
+    - Utilize `imgui-bundle`'s recommended styling APIs to define a cohesive "professional" theme.
+    - Implement a "Subtle Rounding" aesthetic for windows, buttons, and other UI elements.
+    - Research and implement the latest text rendering techniques supported by `imgui-bundle` or its forks (e.g., Freetype integration).
+- **Advanced Visual Effects (Shaders):**
+    - Explore and implement custom shaders for:
+        - Rounded window corners and soft shadows.
+        - Glass/Acrylic (blur) effects for panels.
+        - Improved text anti-aliasing via specialized shaders.
+- **Multi-Viewport Support:**
+    - Add a toggle in the main menu bar to enable/disable ImGui's **Multi-Viewport** feature (allowing panels to be dragged outside the main application window).
+- **UI Layout Presets:**
+    - Implement a system for users to save and manage custom window layouts.
+    - Layout presets must capture window positions, sizes, and the current **Multi-Viewport** state.
+
+## Non-Functional Requirements
+- **Performance:** Ensure that custom shaders and advanced rendering do not significantly impact the application's frame rate (FPS).
+- **Compatibility:** The new theme and style system must be compatible across all supported platforms (win32).
+- **Reliability:** Layout presets must be persisted correctly and restored accurately.
+
+## Acceptance Criteria
+- [ ] The default font is changed to Inter or Maple Mono with high-quality rendering.
+- [ ] The UI has a consistent "Subtle Rounding" aesthetic across all standard widgets.
+- [ ] A "Multi-Viewport" toggle is available in the menu bar and works as expected.
+- [ ] Users can save multiple window layout presets and switch between them.
+- [ ] Custom shaders are implemented for at least one major effect (e.g., rounded corners or acrylic blur) without degrading performance.
+
+## Out of Scope
+- Complete redesign of the Hub-based layout logic (only styling/theming).
+- Cloud-based layout synchronization.