feat: use solarized color scheme

[amonks]

• adds coherent color scheme
• adds darkmode toggle
• makes color.Hash produce a lipgloss.AdaptiveColor with light and dark variants (same hue)
• adds "style" parameter to logview render (breaking change; worth doing this alone before 1.0 if logview is public API)
• makes the menu/log selection more obvious by toggling their backgrounds on focus

[!NOTE] weird bug; probably won't fix on the interleaved log, we style the task ID labels at log-ingestion time, not at render time, which means they come out brighter if you happened to be in dark mode when the log was ingested (or darker if you happened to be in light mode)

[!CAUTION] blocker the background makes our bad render performance a lot more obvious--you get visible tearing when you scroll. I bet debugging that would lead to a lot of meaningful improvements, though, so it's worth doing.

[amonks]

[amonks]

[amonks]

I moved the good parts of this into #75.