feat: use screen capture for slides snapshot

[antfu]

Use the same screenshot logic from #1972 by @KermanX, remove the previous html-to-image approach.

• fix Quick overview opening slowly on larger presentations #1889
• fix Snapshot overview not color mode aware #1883

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commit: 8e1edc8

[KermanX]

How about capturing multiple slides simultaneously, which will make the process faster? But this requires more work and introduces complexity, I am not sure if it is worth it.