The source kinds wrap inside the dialog

[WaylandYang]

Follow-up to #386. The twelve source kinds in the New source dialog sat on one non-wrapping row of flex-1 buttons; twelve labels do not fit in 32 rem, so the row ran out of the panel. The old hand-rolled panel had hidden that with its own overflow-y-auto (which clips horizontally too); Dialog does not, and should not.

The row now wraps and each button takes its content width; the selected kind is the primary button, the others secondary, the same pattern the schedule picker uses for its weekday multi-select — and the hand-written u-btn-primary / u-btn-ghost class juggling goes. Measured in the browser: four rows, the widest ending 75 px inside the dialog's edge, no horizontal scroll.

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