Unlock seed once at startup, pass identity to all commands

- main.rs unlocks seed once, prompts passphrase once per app launch
- Identity passed as parameter to send, recv, register, chat
- No more redundant load_seed() calls (was prompting passphrase multiple times)
- info command uses pre-unlocked identity directly

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

warzone/crates/warzone-client/src/cli/recv.rs

@@ -1,17 +1,15 @@
 use anyhow::{Context, Result};
+use warzone_protocol::identity::IdentityKeyPair;
 use warzone_protocol::ratchet::RatchetState;
 use warzone_protocol::types::Fingerprint;
 use warzone_protocol::x3dh;
 use x25519_dalek::PublicKey;
 
 use crate::cli::send::WireMessage;
-use crate::keystore;
 use crate::net::ServerClient;
 use crate::storage::LocalDb;
 
-pub async fn run(server_url: &str) -> Result<()> {
-    let seed = keystore::load_seed()?;
-    let identity = seed.derive_identity();
+pub async fn run(server_url: &str, identity: &IdentityKeyPair) -> Result<()> {
     let our_pub = identity.public_identity();
     let our_fp = our_pub.fingerprint.to_string();
     let db = LocalDb::open()?;