feat(dashboard): add a weather launcher (wttrin)

A Weather launcher joins the dashboard's top row after Agenda, on key w, drawn with the nf-weather-day_sunny_overcast Weather Icons glyph. It opens the wttrin forecast through call-interactively so wttrin's location prompt runs. A bare (wttrin) call errors, since the command takes the location as a required argument that its interactive form supplies.

Row sizes move from 4-4-3-3 to 5-4-3-3. The launcher table stays the single source for both the navigator icons and the keymap.

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