#2 feat: per-context audio fingerprinting and screen spoofing patches

[PopcornDev1]

Summary

Adds per-context audio fingerprint and screen dimension spoofing patches. Disables WebRTC IP spoofing patch until further testing. Removes superseded screen-hijacker patch.

Changes

audio-fingerprint-manager.patch (new)

• Creates AudioFingerprintManager.h/cpp for per-context audio fingerprint seed storage via RoverfoxStorageManager
• Adds window.setAudioFingerprintSeed(seed) WebIDL binding
• Hooks all 6 audio fingerprinting API methods for comprehensive protection:
  • AudioBuffer.getChannelData() - hooked in RestoreJSChannelData()
  • AudioBuffer.copyFromChannel() - hooked after copy operation
  • AnalyserNode.getFloatFrequencyData() - hooked in ProcessData lambda
  • AnalyserNode.getByteFrequencyData() - hooked via underlying buffer
  • AnalyserNode.getFloatTimeDomainData() - hooked in ProcessData lambda
  • AnalyserNode.getByteTimeDomainData() - hooked before byte conversion
• Transformation uses 0.8% variance with non-linear polynomial component:
  • Linear base: 0.996 + normalized * 0.008
  • Polynomial twist: (normalized^2 - 0.5) * 0.002
  • Deterministic per seed, imperceptible to human hearing
• Uses SOURCES instead of UNIFIED_SOURCES in moz.build to avoid namespace pollution (file starts with 'A', comes before BarProps.cpp in unified compilation)
• Adds LOCAL_INCLUDES += ["/dom/base"] to dom/media/webaudio/moz.build for cross-directory header access

screen-spoofing.patch (new, replaces screen-hijacker.patch)

• Creates ScreenDimensionManager.h/cpp for per-context screen dimension storage
• Adds window.setScreenDimensions(width, height) and window.setScreenColorDepth(depth) WebIDL bindings
• Hooks nsScreen::GetRect() with fallback chain:
  1. Per-context ScreenDimensionManager lookup (new)
  2. Global MaskConfig screen.width/height (carried over from screen-hijacker)
  3. Vanilla Firefox behavior
• Hooks nsDeviceContext::GetDeviceSurfaceDimensions() for global MaskConfig override
• Removes RDM device size check in nsMediaFeatures.cpp (prevents interference)
• Complete superset of screen-hijacker.patch functionality

webrtc-ip-spoofing.patch.disabled (renamed)

• Disabled until it is fully tested and stable, currently detected.

screen-hijacker.patch (deleted)

• All functionality is now included in screen-spoofing.patch
• No longer needed

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch audio-screen-spoofing

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