The Skills tab's three panes are now all drag-resizable:
- List/detail column seam: MasterDetail grows an optional resizeId that
turns the seam between the rail and the detail pane into a vertical
drag sash (same visual language as DetailPane's top-edge sash). The
rail width persists in the shared pane store under that id;
double-click resets to the default 0.75fr track. Skills and Tools
tabs share one id so the split stays consistent across tabs.
- Skills Hub section: the embedded hub picker's top edge is now a drag
sash — pull the hub pane up to grow it (the skills list above
absorbs the change). Height persists through the same pane store,
double-click resets, and the cross-origin iframe gets
pointer-events:none during the gesture so it can't swallow the drag.
Replaces the old native CSS corner-resize handle.
- The skill editor bottom pane already resized via DetailPane's sash.
MASTER_DETAIL_WIDE_COLS keeps its exported shape (MCP tab reads it) —
the --md-split var falls back to the declared track when unset, so
grids without a sash render exactly as before.
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