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Patrick Buckley
f8f7152d63
Revives the split-pane feature retired with ui/static (step 6), rebuilt on PaneManager: an optional binary layout tree (null = the one-pane-per- tab behaviour, unchanged) renders visible panes as %-inset cells — no reparenting, so live stream DOM, scroll state and media survive layout changes. Tabs stay global: the active tab is the focused cell, a backgrounded tab swaps into it, clicking inside a visible pane focuses its cell, .shown marks visible-unfocused tabs. Separators resize by pointer-capture drag and arrow keys (role=separator + aria-value*); the tree persists in the working-set blob and rehydrate prunes leaves whose pane did not restore. Limits: 6 cells, 200x150 cell minimums, denials toast the manager's reason. Affordance: Split right / Split down / Unsplit buttons in the tab-bar tail replace the redundant [+] (the permanent Dashboard tab is the launcher) — deliberately no contextmenu override this time. The dead TS_APP.focusLauncher seam goes with it. Measured chrome: the focused cell wears a 2px accent top bar (no thin tinted ring clears 3:1 in both themes) plus a 55%-mix inset ring; separators rest at --ink-4 with solid-accent hover/drag/focus; .shown tabs carry an accent underline; the tail cluster is fenced and lifted to --ink-3. scripts/livepass.py grows a third surface: shell/livepass.html boots the real shell.js + pane.js and drives ?split=right|down|three|none (+ &theme=light), stamping SPLIT-READY-<cells> / SPLIT-FAILED-<reason>.