- markdown tabs open in rendered preview with a 预览/编辑 segmented toggle;
edit mode uses the CodeMirror source editor (markdown highlighting), the
preview renders the live unsaved draft, and the editor stays mounted while
previewing so edits survive the toggle.
- an empty pane shows openable-type cards (explorer / git / terminal, the
same options as the + menu, terminal dimmed at the cap) instead of the
bare 'this pane is empty' message; clicking a card opens the tab.
- the + button sits immediately right of the last tab (sticky at the
scrollport's right edge when the tab row overflows, so it stays
reachable).
Menghuan1918
97e1f60e47