desktop: full relay-integrated Import Follow List dialog
Rewrites ImportFollowListDialog with complete relay integration:
- Resolves identifiers: npub, hex, NIP-05 HTTP (via OkHttp), Namecoin
- Fetches kind 3 (ContactListEvent) from relays via subscription
- Parses follow list (p-tags) into selectable entries
- Fetches kind 0 metadata for display names (best-effort)
- Shows preview with select all/deselect all + individual toggles
- Publishes new kind 3 via broadcastToAll with selected follows
- State machine: Idle → Resolving → Fetching → Loaded → Publishing → Done
- Proper cleanup: DisposableEffect unsubscribes on dismiss
- 15s timeout for kind 3, 20s timeout for metadata enrichment
- Updates Main.kt call site to pass relayManager, account, localCache
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