Models: sort list by "the last 5 used", then alphabetically

[fmaclen]

REF https://github.com/fmaclen/hollama/issues/104#issuecomment-2254157952

This will likely need UI work first, current competing efforts:

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• [ ] Group models by "Last 5 used" / "Other"
• [ ] Include a <Badge> with the model size next to each model