Give lane selection its keyboard entry — ⌥↑ escalates; header clicks select

Every lane command keyed off "a selected lane" with no drag-free way to
create one. Settled: ⌥↑ with the lane's first card selected selects the
lane (↓/⌥↓ descend back; ⌥↑ then inert), an empty selection seeds at the
first lane's first card, and a plain click on the lane title bar selects
with the drag surface engaging only on movement.

Claude-Session: https://claude.ai/code/session_01HJ7PhFNmQ19bvy9RMD6GSb
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2026-07-26 20:45:10 -04:00
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@@ -17,7 +17,7 @@ Toolbars are **pure enhancement**: every function they host already has a menu i
## Lane
- Title bar: leading SF Symbol (the lane's `icon`), title, **card-count badge** (quiet, secondary styling), new-card button. The whole title bar is the lane's drag surface — no separate grip. The count reads the search filter like every other surface (04-interactions.md): during a search it shows the visible count, not the total.
- Title bar: leading SF Symbol (the lane's `icon`), title, **card-count badge** (quiet, secondary styling), new-card button. The whole title bar is the lane's drag surface — no separate grip; a plain click (no movement) on it selects the lane (04-interactions.md ▸ Selection). The count reads the search filter like every other surface (04-interactions.md): during a search it shows the visible count, not the total.
- Body: vertical card stack (masonry grid when wide — settled, the pathfinder's masonry works), scrolls vertically.
- Right-edge **drag-to-resize** between integer widths (1×, 2×, 3×, … — no cap): shadow snaps at the inter-column gap with 10pt release hysteresis; the window grows/shrinks by one standard width per snap so other lanes keep their exact size. **Growth hard-stops at the screen's visible frame, with rubber-band feedback** (the dragged edge gives a fraction of the overshoot and snaps back, signalling the bound — pathfinder behavior, proven): the drag never compresses siblings and the window never overflows the screen. The header context menu's Width control (stepper, uncapped) is the precise control — and deliberately the opposite mechanism: it never touches the window, it **re-divides** the existing width across the new unit total (siblings compress). Widths beyond the screen's capacity stay reachable through it. The **Increase/Decrease Lane Width menu items (⌥⌘→/⌥⌘← — 11-command-nexus.md) are this stepper's keyboard face** — same re-divide semantics, never the window's size; window-growing behavior belongs to the drag alone.