Fix live preview table gaps#100
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Summary
Fixes the extra vertical space around rendered Markdown tables in live preview.
Root Cause
CodeMirror was keeping visual line boxes for inactive blank lines adjacent to table block widgets. The table itself was replaced by a live preview widget, but the surrounding blank Markdown lines still occupied editor height.
Changes
cm-lp-block-gap-hiddenline decoration to collapse those retained placeholder lines.Validation
npm test -- --run src/features/editor/extensions/livePreviewBlocks.test.ts src/features/editor/extensions/livePreviewInline.test.tsgit diff --check