Add Layer Styles submenu to the Timeline and Composition viewer layer context menu, matching After Effects parity and the application Layer ▸ Layer Styles menu.
- Adds Layer Styles submenu between Blending Mode and Effects
- Exposes Layer Style Options..., Convert to Editable Styles, Show All, Remove All, and the 9 individual styles
- Translates Layer Styles across all 7 UI catalogs
- Adds regression test verifying submenu presence, position, and action invocation