feat(theme-studio): base-edit recolors a family; retire the ramp panel

Editing a family's base now recolors the whole family: update-selected on a base with a ramp regenerates the family from the new base at the same count, so references follow the new hexes (shared regenFamilyInPlace with the count control). Editing a ground swatch already writes the bg/fg assignment through the existing repoint, and the gate confirms it.

The standalone ramp panel is gone — its button, panel, JS, CSS, and the #ramptest gate are removed. Fanning a color into a ramp now happens from its strip: add a color, then raise its column's count. The ramp() math stays in app-core; only the duplicate UI is retired.

Phase 5 of the color-families spec. A #baseedittest gate covers the base-edit recolor (family follows, references repoint, count preserved) and the bg-swatch edit writing the assignment.

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