feat: Add fg link tokens

[takashimokobe]

Add color.fg.link.default and color.fg.link.hover to sana.json theme. This color should be used for standalone hyperlinks.

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Visual Comparison

theme/sana.json

Token name	Old value	New value
base.letter-spacing.5	""	0
sys.color.fg.link.default	none	{base.palette.blue.600}
sys.color.fg.link.hover	none	{base.palette.blue.700}