Render the content pane as tabs of nested split trees, each session leaf a live
attach mounted through the multi-mount pool:
- #30 arbitrarily-nested H/V splits with mouse-resizable dividers; per-pane
⏻/▥/▤/✕ tools; closing a pane collapses its parent split.
- #31 tabs, each holding its own tree; add / switch / close.
- #32 drag-to-dock: drag a pane title or a sidebar session onto a pane for a
5-zone dock (edges split, centre swaps/replaces); a sidebar drag moves an
already-open session.
- #33 focused pane at full strength, others dim; sidebar shows focused (loud)
vs open-elsewhere (quiet) with a stable per-session colour mapping rows to
panes.
Opening a session fills the focused pane (single-pane parity by default);
multi-pane is opt-in via split / drag / tabs. Panes auto-close when their
session ends (guarded against eviction and intentional close). The steady
"connected" label is hidden as noise.
Closes#30, #31, #32, #33. Part of epic #37.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
