refresh: stack al día (vello 0.7 / wgpu 27 / parley 0.6) + motor 3D voxel

Re-sincroniza las fuentes desde el monorepo (estaba en vello 0.5/wgpu 24 y con la
estructura vieja de eventloop) y suma el 3D:

- bump del workspace a vello 0.7 / wgpu 27 / parley 0.6, + accesskit 0.24 /
  accesskit_winit 0.33 / vello_hybrid 0.0.9.
- nuevos crates: llimphi-3d (voxels ray-march + mallas en un depth compartido,
  montable dentro de un View 2D vía set_viewport+scissor) y llimphi-voxel
  (world-gen, personajes, director de escenas) + shared/foreign-vox (puente .vox).
- README: sección "Not just 2D — a 3D voxel engine" + GIF (docs/llimphi_voxel.gif).
- excluido modules/allichay (arrastra deps fuera del alcance del front-door).
- cargo check --workspace: verde.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

widgets/gallery/Cargo.toml

@@ -17,7 +17,6 @@ llimphi-theme = { workspace = true }
 llimphi-widget-app-header = { workspace = true }
 llimphi-widget-banner = { workspace = true }
 llimphi-widget-button = { workspace = true }
-llimphi-widget-card = { workspace = true }
 llimphi-widget-list = { workspace = true }
 llimphi-widget-splitter = { workspace = true }
 llimphi-widget-stat-card = { workspace = true }
@@ -25,7 +24,6 @@ llimphi-widget-tabs = { workspace = true }
 llimphi-widget-theme-switcher = { workspace = true }
 llimphi-widget-text-input = { workspace = true }
 llimphi-widget-tiled = { workspace = true }
-llimphi-widget-tree = { workspace = true }
 llimphi-widget-menubar = { workspace = true }
 llimphi-widget-context-menu = { workspace = true }
 app-bus = { workspace = true }