TUI client: WebSocket with HTTP fallback

poll_loop now:
1. Tries WebSocket connection to /v1/ws/<fingerprint>
2. On success: receives messages in real-time (instant push)
3. On disconnect: reconnects after 3 seconds
4. On WS failure: falls back to HTTP polling every 2 seconds

Refactored message processing into shared functions:
- process_incoming() handles raw bytes
- process_wire_message() handles deserialized WireMessage
- Used by both WS and HTTP paths

Both CLI TUI and web client now use WebSocket:
- No more HTTP polling spam in server logs
- Messages arrive instantly on both clients
- HTTP poll kept as fallback for scripts/mules

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

warzone/crates/warzone-client/Cargo.toml

@@ -27,3 +27,6 @@ bincode.workspace = true
 libc = "0.2"
 uuid.workspace = true
 chrono.workspace = true
+tokio-tungstenite = { version = "0.24", features = ["native-tls"] }
+futures-util = "0.3"
+url = "2"