0.18.1: editor-hide cascades to groups + rename for layers & clip tracks

Track groups get the same editor-hide affordance as layer and clip
tracks: new eye button on the group header, setGroupEditorHidden
action (clears selection pointing inside the group), and a cascade
through the Konva stackItems + render.ts so every child track in a
hidden group vanishes in the editor.

Track renaming via right-click context menu now covers layers and
clip tracks too — setLayerName / setClipTrackName actions, new i18n
strings, and end-to-end UI tests driving the menu → promptDialog →
rename flow.

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

src/i18n/messages.ts

@@ -237,6 +237,14 @@ export const en = {
       title: 'Rename audio track',
       confirm: 'Apply',
     },
+    renameLayerDialog: {
+      title: 'Rename layer',
+      confirm: 'Apply',
+    },
+    renameClipTrackDialog: {
+      title: 'Rename clip track',
+      confirm: 'Apply',
+    },
     removeAudioClipDialog: {
       title: 'Remove audio clip?',
       message: 'Remove this audio clip from the timeline.',
@@ -248,6 +256,8 @@ export const en = {
     audioMuted: 'Muted — click to unmute',
     muteAudioTrack: 'Mute track',
     renameAudioTrack: 'Rename audio track',
+    renameLayer: 'Rename layer',
+    renameClipTrack: 'Rename clip track',
     ungroup: 'Ungroup',
     groupSelected: 'Group {n} selected layers',
     convertToClip: 'Convert {n} selected to clip',