feat: user profile

[0xAlunara]

This PR is not even close to being finished, but because I'm touching global settings and stores that are all over place in the apps, I want to keep it small and not keep the PR open too long.

• The user profile button shows only in beta mode. That means it won't show up in production
• The user profile button replaces the advanced toggle and theme switcher button
• The user profile is available even when no wallet is connected, because there's global settings there that are important even without a wallet. It'll show the 0x0000 address if there's no wallet connected.
• I've decided to create new theme switching and advanced mdoe toggle components instead of re-using the switch-theme and switch-advanced-mode toggles. They differ enough that I couldn't re-use them in the user profile. I'm not sure if we want to keep those components as generic 'features', rather than just part of the component that hosts them.
• At the moment to keep things small and simple only the advanced toggle and theme switcher are implemented. No metrics, no disconnect button.
• Both these two settings reside in a new store specific to the feature, useUserProfileStore().
• In addition, the store also contains the configured locale and slippage settings (although not configurable from the UI yet)
• The slippage setting has a hardcoded global value. This used to be called router but was used globally anyway in all four different apps, hence the rename. Any other 'property' is usually a slippage setting for a certain pool & chain id combination.
• All four properties (advanced mode, theme, locale, slippage) have been removed from the app or global Zustand slices. Hence the reason this PR is so big: the entire app now needs to use the new store.
• The store is persisted in local storage. This means that until we merge all 4 apps, the different apps don't share a global persisted state. However, this is already the case in production.
• There's no tests yet given the feature isn't released yet and is bound to change as it gets developed over time.
• Current header tests fail of course, can fix that before merging.

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The base branch was changed.