refactor(dashboard): derive the navigator and keybindings from one launcher table

The 12 dashboard launchers were inlined twice (once as navigator icon buttons, once as dashboard-mode-map keybindings), so adding or reordering one meant editing both lists, and the icon-row order could drift from the key order.

I pulled them into a single cj/dashboard--launchers table of (KEY ICON-FN ICON-NAME LABEL TOOLTIP ACTION) tuples. cj/dashboard--navigator-rows chunks it four per row into the navigator buttons, and cj/dashboard--bind-launchers binds each key to its action. The icons and the keys now come from one place, with no behavior change: same icons, labels, order, and keys, locked by tests.

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