fix: i18n translations and annotation property changes on selected objects
- Complete English translation catalog (44 entries fixed/added) - Fix Fabric.js Group cache invalidation (active.dirty = true) so color, thickness and line-dash changes are visible on selected markers/arrows - Fix Italian .po placeholder mismatch (%(detail)s -> %(error)s) - Bump annotation-editor.js cache buster to v8 Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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