feat: add cloud save timestamp and force sync button

Shows a relative time label (e.g. "☁️ 2m ago") in the resource bar
seeded from the server on load and updated after every auto-save or
manual save. A 💾 button lets players trigger an immediate cloud save
outside the 30-second auto-save cycle, with a ⏳ spinner and disabled
state while the request is in-flight.

apps/web/src/styles.css

@@ -1171,6 +1171,38 @@ body {
   color: var(--colour-text);
 }
 
+.save-status {
+  color: var(--colour-text-muted);
+  font-size: 0.75rem;
+  white-space: nowrap;
+}
+
+.force-save-button {
+  align-items: center;
+  background: rgba(255, 255, 255, 0.06);
+  border: 1px solid rgba(147, 51, 234, 0.4);
+  border-radius: 50%;
+  color: var(--colour-text);
+  cursor: pointer;
+  display: flex;
+  font-size: 0.9rem;
+  height: 2rem;
+  justify-content: center;
+  padding: 0;
+  transition: all 0.2s;
+  width: 2rem;
+}
+
+.force-save-button:hover:not(:disabled) {
+  background: rgba(147, 51, 234, 0.2);
+  border-color: var(--colour-accent-light);
+}
+
+.force-save-button:disabled {
+  cursor: not-allowed;
+  opacity: 0.5;
+}
+
 /* ── Public Profile Page ────────────────────────────────────────────────── */
 
 .profile-page {