feat: add `fmt_icon()` method #2145

Job	Run time
build (3.9)	1m 20s
build (3.10)	1m 18s
Test for saving table image with browser	2m 45s
build (3.11)	1m 14s
build (3.12)	1m 26s
build (3.13)	1m 30s
test-pandas	42s
test-windows	4m 52s
Release to pypi	0s
	15m 7s

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