Add HDR/Advanced Color detection and awareness

[Copilot]

Implements HDR display detection via Windows Display Configuration APIs and adds user-facing controls without interfering with system color management.

Implementation

HDR Detection (HdrColorManager.cs)

• P/Invoke to DisplayConfigGetDeviceInfo with DISPLAYCONFIG_GET_ADVANCED_COLOR_INFO
• Detects support/enabled status, color bit depth, Windows 11 Auto Color Management
• Safe fallback to SDR capability on errors

UI Integration

• System tray menu shows HDR status: Active (10-bit), Supported (Not Enabled), or SDR Display
• Toggle for HDR-aware rendering (adjusts default color temperature from 0.5 to 0.55)
• Updates help dialog with current HDR state

Technical Approach

• Standard WPF rendering in sRGB; Windows DWM handles HDR conversion
• No ICC profile modification or custom color space management
• Zero impact on other applications' color pipelines

Manifest

• Added Windows 10+ compatibility declarations for advanced color APIs
• Maintains Per-Monitor V2 DPI awareness

Example

// Detect HDR capability at startup
_hdrCapability = HdrColorManager.DetectHdrCapability();

if (_hdrCapability?.IsHdrActive == true && _hdrAwareRenderingEnabled)
{
    SetColorTemperature(HdrColorManager.GetRecommendedColorTemperatureForHdr());
}

System tray menu dynamically reflects capabilities:

• 🎨 HDR Active (10-bit) + ✓ HDR-Aware Rendering toggle
• 🎨 HDR Supported (Not Enabled) for hardware-capable displays
• 🎨 SDR Display for standard displays
• ℹ️ Auto Color Management Active on Windows 11+

Original prompt

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This section details on the original issue you should resolve

<issue_title>Fully support HDR</issue_title>
<issue_description>What's involved to support HDR fully without affecting other apps</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Fully support HDR #24

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