SELF-1777: Update settings menu with new Euclid design (wip)

[transphorm]

Motivation

• Introduce a Euclid-based settings UI so the app can present a richer, consistent settings view from the Euclid component library.
• Expose the Euclid settings screen in app navigation so the new UI can be reached from account settings and the router type system is aware of the route.
• Keep rollout safe by gating the new menu entry behind the existing IS_EUCLID_ENABLED flag and matching status-bar/header setup used by other Euclid screens.

Description

• Added app/src/screens/account/settings/EuclidSettingsScreen.tsx which renders a settings UI using SettingsViewScreen from @selfxyz/euclid and composes CTAs, sections, connect buttons, and bottom items.
• Wired the new route into navigation by adding EuclidSettings to app/src/navigation/account.ts (native) and app/src/navigation/account.web.ts (web), and updated app/src/navigation/index.tsx types to include EuclidSettings.
• Updated app/src/screens/account/settings/SettingsScreen.tsx to add a Euclid menu entry (icon/label/route) that is inserted when IS_EUCLID_ENABLED is true and added the small route typing to RouteLinks so menu navigation accepts the new route.
• Matched header/status-bar configuration to existing Euclid usage by using HeadlessNavForEuclid when registering the EuclidSettings screen, and replaced a couple of hard-coded links with centralized constants (selfUrl, discordUrl, etc.).

Testing

• No automated tests were executed as part of this change (no CI/test runs were performed locally).
• Recommended automated checks to run before merge: yarn nice, yarn types, yarn test, and yarn build per repo AGENTS.md guidance.

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