feat: group migrate GGUFs with adopt-or-edit and hub family reuse

[SoryAK]

Summary

• Migrate lists GGUF quant clusters as groups, with each filename in the preview so you can see the set before choosing.
• For a multi-file group, TTY offers adopt (take all) or edit (unmark to drop, mark to add, then adopt the rest). Family is asked once per remaining set; pull/search reuse names already in the hub.
• --yes / --json still take whole groups with no extra prompts. Singletons keep id + family.

Test plan

• mba migrate find llama — pick a multi-file cluster, confirm the preview lists files, adopt the whole group, family once, quiet bulk ADOPTED rows
• Same flow, edit: unmark one quant, optionally mark a stray, Enter adopts the rest
• Singleton GGUF still asks for id + family
• mba models search / TTY mba models pull … --id … (no --family) offers existing hub families + new
• --yes / --json skip adopt/edit and take whole groups
• Esc at adopt/edit/family still cancels

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