Add app server connection selector

[RhysSullivan]

Summary

• Adds the app-shell server profile menu for desktop, local, and custom HTTP Executor endpoints.
• Adds an unreachable-server fallback so users can switch profiles instead of seeing a dead shell.
• Moves the selector into the sidebar header as a compact icon-only control.

Product Scope

This PR does not add hosted cloud login, cloud navigation, cloud API-key docs, or a distinct cloud server kind. Custom endpoints are plain HTTP Executor server profiles.

Validation

• bun run typecheck in packages/app
• bun x oxfmt --check packages/app/src/web/server-connection-menu.tsx packages/app/src/web/shell.tsx packages/app/src/routes/__root.tsx packages/app/package.json bun.lock
• bun x oxlint -c .oxlintrc.jsonc packages/app/src/web/server-connection-menu.tsx packages/app/src/web/shell.tsx packages/app/src/routes/__root.tsx --deny-warnings

Stack

1. Harden SQLite import checkpoint handling #863
2. Add shared Executor server connection model #864
3. Teach CLI and local server shared connections #865
4. Persist desktop server profiles through Electron #866
5. Add app server connection selector #861 👈 current

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commit: 4d4f02e