feat: add theme field to Icon type for light/dark mode support (#1978) #446

Job	Run time
checks / readme-snippets	15s
checks / pre-commit	33s
checks / test (3.10, lowest-direct, ubuntu-latest)	50s
checks / test (3.11, locked, windows-latest)	2m 31s
checks / test (3.12, lowest-direct, windows-latest)	3m 42s
checks / test (3.11, lowest-direct, ubuntu-latest)	50s
checks / test (3.11, lowest-direct, windows-latest)	2m 37s
checks / test (3.13, lowest-direct, ubuntu-latest)	49s
checks / test (3.10, locked, windows-latest)	2m 16s
checks / test (3.14, locked, ubuntu-latest)	2m 15s
checks / test (3.14, lowest-direct, ubuntu-latest)	1m 19s
checks / test (3.11, locked, ubuntu-latest)	47s
checks / test (3.13, locked, windows-latest)	2m 22s
checks / test (3.13, lowest-direct, windows-latest)	2m 38s
checks / test (3.12, locked, ubuntu-latest)	53s
checks / test (3.12, locked, windows-latest)	3m 22s
checks / test (3.12, lowest-direct, ubuntu-latest)	58s
checks / test (3.10, lowest-direct, windows-latest)	2m 29s
checks / test (3.10, locked, ubuntu-latest)	50s
checks / test (3.13, locked, ubuntu-latest)	44s
checks / test (3.14, locked, windows-latest)	3m 53s
checks / test (3.14, lowest-direct, windows-latest)	2m 22s
all-green	2s
	39m 17s

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