0.5.6: show/hide locked tracks + group lock + crop/mask-preview split

- Timeline: new show/hide toggle next to snap; locked tracks (including
  layer, clip, and the new group lock) are filtered from the timeline
  when the toggle is off. Preference lives in localStorage and is
  shared across components via a module-level ref.
- Groups become lockable via the same inline lock toggle. A locked
  group propagates to its children: they behave as effectively locked
  in the timeline and on the stage. Collapse/expand still works on a
  locked group.
- Canvas: layers in locked+hidden tracks render as a 1px outline in
  the layer (or fill) color instead of their full fill, and are
  draggable:false / listening:false. Mask layers keep their dashed
  ghost styling; masks still apply in the preview overlay regardless
  of lock or show state.
- drawSceneFrame gains an optional `{ crop }` option; the mask-preview
  overlay passes the editor's crop toggle through, so the two controls
  are fully independent. Crop changes now also trigger a preview
  redraw via a watcher dep.
- Tests: new suites for show-locked persistence, group lock store
  action, crop option on drawSceneFrame (including mask+crop combos).
  Properties transparent-toggle tests now reset the section prefs
  localStorage so the Appearance section is guaranteed open when the
  panel mounts.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/version.ts

@@ -1,2 +1,2 @@
-export const APP_VERSION = '0.5.5'
+export const APP_VERSION = '0.5.6'
 export const APP_NAME = 'RUWIO'