feat: #3555110 Symmetric translation

christian.wiedemannrequested to merge
issue/display_builder-3555110:3555110-symmetric-config-translation-cw-2 into 1.0.x

Config buildables move from save-time diff extraction to full-tree storage per language, with symmetric merge on load — mirroring the ui_patterns #3548884 Revision 2 model. Reuses ComponentTree utilities; adds schema for the dedicated source_tree override key.

Co-Authored-By: Claude Opus 4.8 noreply@anthropic.com

Closes #3555110

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