feat: UI 3 volets (Hermes stub, dashboard tuiles, terminal xterm.js)

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

client/src/panels/Dashboard.tsx

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+// client/src/panels/Dashboard.tsx
+import { useEffect, useState } from "react";
+import type { MachineView } from "@shared/types.js";
+import { api } from "../lib/api.js";
+import { MachineTile } from "../features/machines/MachineTile.js";
+import { AddMachineModal } from "../features/machines/AddMachineModal.js";
+
+interface Props { onSelect: (id: string) => void; }
+
+export function Dashboard({ onSelect }: Props) {
+  const [machines, setMachines] = useState<MachineView[]>([]);
+  const [counts, setCounts] = useState<Record<string, number>>({});
+  const [adding, setAdding] = useState(false);
+
+  async function load() {
+    const ms = await api.listMachines();
+    setMachines(ms);
+    const entries = await Promise.all(ms.map(async (m) => {
+      try { return [m.id, (await api.snapshot(m.id)).apt.count] as const; }
+      catch { return [m.id, 0] as const; }
+    }));
+    setCounts(Object.fromEntries(entries));
+  }
+  useEffect(() => { void load(); }, []);
+
+  return (
+    <main className="su-center">
+      <div style={{ display: "flex", justifyContent: "space-between", marginBottom: 16 }}>
+        <h2 style={{ margin: 0 }}>Machines</h2>
+        <button className="interactive" onClick={() => setAdding(true)}>+ Ajouter</button>
+      </div>
+      {machines.length === 0 && <p style={{ color: "var(--ink-3)" }}>Aucune machine. Clique sur « + Ajouter ».</p>}
+      <div className="su-tiles">
+        {machines.map((m) => (
+          <MachineTile
+            key={m.id} machine={m} packageCount={counts[m.id] ?? 0} onSelect={onSelect}
+            onRefresh={(id) => { onSelect(id); void api.refresh(id).then(load); }}
+            onUpgrade={(id) => { onSelect(id); void api.runAction(id, "apt_full_upgrade"); }}
+            onReboot={(id) => { onSelect(id); void api.runAction(id, "reboot"); }}
+          />
+        ))}
+      </div>
+      {adding && <AddMachineModal onClose={() => setAdding(false)} onCreated={load} />}
+    </main>
+  );
+}

client/src/panels/HermesPanel.tsx

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+// client/src/panels/HermesPanel.tsx
+export function HermesPanel() {
+  return (
+    <aside className="su-hermes">
+      <div className="label" style={{ marginBottom: 12 }}>HERMES</div>
+      <p style={{ color: "var(--ink-3)", fontSize: 13 }}>
+        Copilote d'exploitation — à venir. Analyse des mises à jour, plans et rapports
+        seront disponibles ici dans un prochain jalon.
+      </p>
+    </aside>
+  );
+}

client/src/panels/TerminalPanel.tsx

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+// client/src/panels/TerminalPanel.tsx
+import { useEffect, useRef } from "react";
+import { Terminal } from "@xterm/xterm";
+import { FitAddon } from "@xterm/addon-fit";
+import "@xterm/xterm/css/xterm.css";
+import { connectOutput } from "../lib/ws.js";
+
+export function TerminalPanel({ machineId }: { machineId: string | null }) {
+  const ref = useRef<HTMLDivElement>(null);
+
+  useEffect(() => {
+    if (!ref.current) return;
+    const term = new Terminal({
+      fontFamily: "'Share Tech Mono', monospace", fontSize: 12,
+      theme: { background: "#1d2021", foreground: "#ebdbb2" },
+      convertEol: true,
+    });
+    const fit = new FitAddon();
+    term.loadAddon(fit);
+    term.open(ref.current);
+    fit.fit();
+    term.writeln(machineId ? `# flux ${machineId}` : "# sélectionne une machine");
+    const disconnect = machineId ? connectOutput(machineId, (c) => term.write(c)) : () => {};
+    return () => { disconnect(); term.dispose(); };
+  }, [machineId]);
+
+  return <div className="su-terminal" ref={ref} style={{ padding: 6 }} />;
+}