perf: offload BeautifulSoup parsing to a thread via `asyncio.to_thread` #410

Job	Run time
PR title check	3s
Code checks / Actions lint check	33s
Code checks / Spell check	5s
Doc checks / Doc checks / Docs check	1m 48s
Code checks / Lint check / Lint check (3.10)	29s
Code checks / Lint check / Lint check (3.13)	25s
Code checks / Lint check / Lint check (3.14)	30s
Code checks / Type check / Type check (3.12)	28s
Code checks / Type check / Type check (3.11)	24s
Code checks / Type check / Type check (3.10)	29s
Code checks / Type check / Type check (3.14)	27s
Code checks / Lint check / Lint check (3.12)	32s
Code checks / Lint check / Lint check (3.11)	24s
Code checks / Type check / Type check (3.13)	32s
Tests / Unit tests / Unit tests (ubuntu-latest, 3.12)	5m 55s
Tests / Unit tests / Unit tests (ubuntu-latest, 3.10)	5m 0s
Tests / Unit tests / Unit tests (windows-latest, 3.10)	35m 52s
Tests / Unit tests / Unit tests (ubuntu-latest, 3.14)	3m 39s
Tests / Unit tests / Unit tests (ubuntu-latest, 3.13)	4m 47s
Tests / Unit tests / Unit tests (ubuntu-latest, 3.11)	4m 48s
Tests / Unit tests / Unit tests (macos-latest, 3.11)	5m 20s
Tests / Unit tests / Unit tests (windows-latest, 3.13)	6m 25s
Tests / Unit tests / Unit tests (macos-latest, 3.14)	3m 18s
Tests / Unit tests / Unit tests (macos-latest, 3.10)	3m 44s
Tests / Unit tests / Unit tests (macos-latest, 3.12)	4m 3s
Tests / Unit tests / Unit tests (macos-latest, 3.13)	4m 20s
Tests / Unit tests / Unit tests (windows-latest, 3.11)	7m 38s
Tests / Unit tests / Unit tests (windows-latest, 3.12)	7m 22s
Tests / Unit tests / Unit tests (windows-latest, 3.14)	5m 34s
	1h 54m 54s

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