Implement advanced mixed filament features: Add gradient settings for mixed filaments, including height-weighted cadence and custom filament definitions. Enhance MixedFilamentManager to support custom rows and apply gradient settings during filament generation. Update PrintConfig and GUI to accommodate new configuration options for mixed filament management.

CHANGELOG_v0.3.md

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+## ⚠️ EXPERIMENTAL BUILD - NOT TESTED ⚠️
+
+Based on Snapmaker Orca v2.2.4
+
+This is an alpha release of Full Spectrum with mixed-color filament support.
+
+**THIS HAS NOT BEEN TESTED ON ACTUAL HARDWARE!**
+
+### What's New
+- **Mixed Filaments UI**: Renamed the feature from Dithering to Mixed Filaments and improved row labeling.
+- **Auto + Custom Mixed Filaments**: Auto-generated mixed rows from physical filaments plus manual custom rows via `+`.
+- **Gradient Selector**: Added visual gradient picking for custom mixed rows to control A/B blend ratio.
+- **Cadence Controls**: Added Layer cycle cadence, Height-weighted cadence toggle, and Advanced dithering mode.
+- **Mixed Height Bounds**: Added lower/upper mixed filament height bounds and cycle controls in Process -> Others.
+- **Z Step Controls**: Added dithering Z step size and painted-zone behavior options.
+
+### Changelog
+- Added mixed filament dependency cleanup when a physical filament is removed.
+- Added Process -> Others controls for mixed filament cadence and height behavior.
+- Fixed multiple startup/UI crashes related to mixed filament rows and Others-tab interactions.
+- Fixed gradient selector state handling and crash on color change.
+- Improved sidebar behavior with compact mixed-row spacing and scroll handling for many mixed rows.
+- Improved mixed preview colors with weighted RYB pigment-style blending and normalization.
+- Added invalidation propagation so mixed-setting changes correctly require re-slicing.
+- Updated mixed-setting tooltips with experimental disclaimers and a wiki-availability note.
+
+### Installation
+1. Download `Snapmaker_Orca.exe` (or the full package)
+2. Extract to a folder
+3. Run the executable
+
+### ⚠️ Warning
+- Use at your own risk
+- May produce incorrect G-code
+- Seeking testers with U1 printers
+
+### Known Issues
+- Untested on real hardware
+- Mixed filament behavior may require per-material calibration
+- Advanced dithering is highly experimental and may not match normal dithering color output
+- Height-weighted cadence operates at the layer plane level, not independent per-color subregions in the same XY plane