Fix Shelley UI typography, layout, and button consistency issues

Discord Message

Author: cbro Channel: #feedback Link: https://discord.com/channels/1405685085923049482/1405686161791516873/1454319900364505088

more feedback on the Shelley UI

1. try to avoid wrapping on the conversation slug. the slug should get a whole line. choose a font size appropriate for the Xth percentile on slug length that gets generated. or choose a narrower font.
2. typography, generally. if you're leaning into a monospace font across the entire UI (it wouldn't be my preference), it needs to be a good one. this might be an issue of y'all being on Macs?
3. there are two buttons that create a new conversation
4. inconsistent use of color for affordance vs state - blue is used on the left for active state and also the primary button ("New Conversation") and green is used for the "+" button that does the same thing.
5. refreshing or navigating to a shelley conversation results in a flash on the route and a reroute to the most recent conversation rather than the one originally requested.
6. maybe a matter of taste, but the spinning emojis feel really cheap, like Sonnet 3.7 kind of level of design.