polish iOS server management flow

[austin-smith]

Problem

BitDream/Views/iOS/iOSServerList.swift:14 is functional, but the server-management experience feels custom-sheet-heavy and less native than the rest of the app.

Goal

Make server management feel like a first-class iOS settings flow with clearer status, better affordances, and more native list interactions.

Opportunities

• Replace custom header/footer patterns with a more native navigation and toolbar treatment.
• Add clearer indication of the current/default server.
• Surface connection test or health status in the server list.
• Add swipe actions for edit and delete where appropriate.

Acceptance Criteria

• Server management feels native on iPhone and consistent with the rest of the iOS UI.
• Current/default server state is clearly visible.
• Users can quickly edit or delete servers with standard iOS interactions.
• Server connection state or test feedback is visible enough to help users diagnose setup problems.
• The flow remains SwiftUI-native and stays within the existing iOS-specific file boundary.