fix: preview close — layout-aware split collapse + focus restore - #65
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closePreview now handles two cases properly: 1. Split pane: removes the preview's leaf from the layout tree. Sibling pane expands to fill the space. Group state synced. 2. Dedicated tab (single leaf): switches to the last active session instead of always picking sessions[0]. Previously closePreview only removed from previewPanes/paneOrder arrays but never touched the layout tree, leaving ghost leaves. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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closePreview now removes the preview leaf from the layout (split pane case) or falls back to last session (dedicated tab case). Previously left ghost leaves in the layout tree.