refactor(space): separate satellite and mission layer components

src/layers/launches/source.js

@@ -0,0 +1,25 @@
+/** Read launch records and their optional active-orbit catalog with explicit cancellation. */
+export function createLaunchSource({
+  fetchImpl = (...args) => globalThis.fetch(...args),
+} = {}) {
+  return {
+    async getLaunches({ signal } = {}) {
+      signal?.throwIfAborted();
+      const response = await fetchImpl('/api/launches', { signal });
+      if (!response.ok) throw new Error(`HTTP ${response.status}`);
+      const payload = await response.json();
+      signal?.throwIfAborted();
+      if (!Array.isArray(payload) && !Array.isArray(payload?.results))
+        throw new Error('Malformed launch snapshot');
+      return payload;
+    },
+    async getActiveTle({ signal } = {}) {
+      signal?.throwIfAborted();
+      const response = await fetchImpl('/api/celestrak/active', { signal });
+      if (!response.ok) throw new Error(`HTTP ${response.status}`);
+      const text = await response.text();
+      signal?.throwIfAborted();
+      return text;
+    },
+  };
+}