feat: add layers panel with blend modes, effects, and drag reorder

Implements the layer management panel for the image editor (Features 16, 40):
- Blend mode dropdown (16 modes) and opacity slider for active layer
- Layer list with visibility/lock toggles, thumbnails, and inline rename
- Pointer-based drag reorder (not HTML5 drag API)
- Right-click context menu: Duplicate, Merge Down, Flatten All, Delete
- Layer effects section: Drop Shadow, Inner Shadow, Outer Glow, Stroke
- Each effect with enable/disable toggle and full parameter controls
- Wired into EditorRightPanel as the "Layers" tab content
This commit is contained in:
SnapOtter
2026-05-06 23:22:24 +08:00
parent 9eae8369bb
commit fedb7bc2e3
2 changed files with 1012 additions and 2 deletions
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