fix(remote-ssh): streamline connection settings UI

[bobleer]

Summary

• move connection name, ProxyJump, timeouts, and retry policy into a collapsed Advanced settings section
• automatically reveal advanced values when editing an existing non-default connection or importing a ProxyJump host
• replace overflow-prone flex rows with shrink-safe responsive grids and allow the footer to wrap on narrow windows
• add focused coverage for the default-collapsed and existing-configuration edit flows

This is presentation-only: saved connection schemas, defaults, and serialization remain unchanged.

Verification

• pnpm run type-check:web
• pnpm run i18n:audit
• pnpm --dir src/web-ui run test:run src/features/ssh-remote/SSHConnectionDialog.test.tsx src/features/ssh-remote/SSHRemoteProvider.test.tsx
• pnpm run build:web