✨ add `daily mode`, settings page, and `load new artwork` button

[ctcpip]

in this PR:

• adds an options/settings page
• adds a configurable option, 'daily mode', the behavior of which, if enabled, makes it so that new artwork is only automatically fetched once per day
• adds a 'load new artwork' button in the bottom right corner
  • this is mostly expected to be used when 'daily mode' is enabled so users can settle on a particular artwork for the day (or part of the day)
• fixes some hover style rules

the use case for daily mode is that it can be jarring when opening a new tab depending on what artwork is randomly loaded. also, in work environments where things like screen sharing are happening, some artwork may be less than ideal to randomly pop up on a new tab.

resolves #19

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[nikhiltri]

Thanks for the PR! We'll review in the coming weeks.