Deduplicate some Svelte components

[untitaker]

Mostly pure refactor, except for

• ClockDriftAlert. There I removed the dedicated "clock" svg and just use the default alert (!) icon
• I noticed the config gear icon looked wonky at high-resolution. it was probably AI-slop from myself. i replaced it with a bootstrap icon

(the third icon is what's actually in this PR)

I'm waiting on my other PRs (#1132) to get through before un-drafting this, because there's some conflicts.

I also want to simplify the config handling for enabled analyzers, ideally we would generate the list of checkboxes from the backend, so that we can add analyzers without having to modify the frontend.

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