feat(web-ui): show decky IP on SwarmDeckies, drop compose-hash column

Operators want to know what address to poke when triaging a swarm decky;
the compose-hash column was debug scaffolding that never paid off.

DeckyShard has no IP column (the deploy-time IP lives on DecnetConfig),
so the list endpoint resolves it at read time by joining shards against
the stored deployment state by decky_name. Missing lookups render as "—"
rather than erroring — the list stays useful even after a master restart
that hasn't persisted a config yet.

decnet/web/db/models.py

@@ -333,6 +333,7 @@ class SwarmHostView(BaseModel):
 class DeckyShardView(BaseModel):
     """One decky → host mapping, enriched with the host's identity for display."""
     decky_name: str
+    decky_ip: Optional[str] = None  # resolved from the stored DecnetConfig at read time
     host_uuid: str
     host_name: str
     host_address: str

decnet/web/router/swarm_mgmt/api_list_deckies.py

@@ -22,6 +22,15 @@ async def list_deckies(
     shards = await repo.list_decky_shards(host_uuid)
     hosts = {h["uuid"]: h for h in await repo.list_swarm_hosts()}
 
+    # IPs live on the stored DecnetConfig, not on the shard row. Resolve by
+    # decky_name — if the master rebooted without a config, the column falls
+    # back to "—" rather than blocking the list.
+    deploy_state = await repo.get_state("deployment") or {}
+    cfg_deckies = (deploy_state.get("config") or {}).get("deckies") or []
+    ip_by_name: dict[str, str] = {
+        d.get("name"): d.get("ip") for d in cfg_deckies if d.get("name")
+    }
+
     out: list[DeckyShardView] = []
     for s in shards:
         if state and s.get("state") != state:
@@ -29,6 +38,7 @@ async def list_deckies(
         host = hosts.get(s["host_uuid"], {})
         out.append(DeckyShardView(
             decky_name=s["decky_name"],
+            decky_ip=ip_by_name.get(s["decky_name"]),
             host_uuid=s["host_uuid"],
             host_name=host.get("name") or "<unknown>",
             host_address=host.get("address") or "",

decnet_web/src/components/SwarmDeckies.tsx

@@ -6,6 +6,7 @@ import { Boxes, PowerOff, RefreshCw } from 'lucide-react';
 
 interface DeckyShard {
   decky_name: string;
+  decky_ip: string | null;
   host_uuid: string;
   host_name: string;
   host_address: string;
@@ -87,9 +88,9 @@ const SwarmDeckies: React.FC = () => {
               <thead>
                 <tr>
                   <th>Decky</th>
+                  <th>IP</th>
                   <th>State</th>
                   <th>Services</th>
-                  <th>Compose</th>
                   <th>Updated</th>
                   <th></th>
                 </tr>
@@ -98,9 +99,9 @@ const SwarmDeckies: React.FC = () => {
                 {h.shards.map((s) => (
                   <tr key={`${uuid}-${s.decky_name}`}>
                     <td>{s.decky_name}</td>
+                    <td><code>{s.decky_ip || '—'}</code></td>
                     <td>{s.state}{s.last_error ? ` — ${s.last_error}` : ''}</td>
                     <td>{s.services.join(', ')}</td>
-                    <td><code>{s.compose_hash ? s.compose_hash.slice(0, 8) : '—'}</code></td>
                     <td>{new Date(s.updated_at).toLocaleString()}</td>
                     <td>
                       <button