Extend doApply added-item construction beyond wires: SCH_TEXT, SCH_LABEL /
SCH_GLOBALLABEL / SCH_HIERLABEL (position + text + label shape), and SCH_NO_CONNECT.
Serialize text (any EDA_TEXT) and label shape in itemToJson. Moving/deleting existing
items of any type already worked (generic changed->Move and removed->Remove); this adds
their reconstruction on add.
Still uncovered: SCH_SYMBOL (needs lib-symbol + fields/orientation) and graphic shapes
(SCH_SHAPE). Known issues to fix next: adding text freezes the app; circles (SCH_SHAPE)
don't sync; deletes don't apply; wire moves only partially converge.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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