Add Options page for aria2 settings with connection test; wire into manifest

src/options/index.js

@@ -0,0 +1,52 @@
+import { getVersion } from "../lib/aria2.js";
+
+const els = {
+  endpoint: document.getElementById('rpc-endpoint'),
+  secret: document.getElementById('rpc-secret'),
+  btnSave: document.getElementById('btn-save'),
+  btnReset: document.getElementById('btn-reset'),
+  btnTest: document.getElementById('btn-test'),
+  status: document.getElementById('status'),
+};
+
+async function restore() {
+  const { aria2 } = await browser.storage.local.get('aria2');
+  els.endpoint.value = aria2?.endpoint || 'http://localhost:6800/jsonrpc';
+  els.secret.value = aria2?.secret || '';
+}
+
+async function save() {
+  const endpoint = els.endpoint.value.trim();
+  const secret = els.secret.value.trim();
+  await browser.storage.local.set({ aria2: { endpoint, secret } });
+  els.status.textContent = 'Saved.';
+}
+
+async function reset() {
+  await browser.storage.local.remove('aria2');
+  await restore();
+  els.status.textContent = 'Reset to defaults.';
+}
+
+async function testConnection() {
+  els.status.textContent = 'Testing…';
+  try {
+    const res = await getVersion({ endpoint: els.endpoint.value.trim(), secret: els.secret.value.trim() });
+    const version = res?.result?.version || JSON.stringify(res?.result || res);
+    els.status.textContent = `OK: aria2 version ${version}`;
+  } catch (e) {
+    els.status.textContent = `Error: ${e?.message || e}`;
+  }
+}
+
+function wire() {
+  els.btnSave.addEventListener('click', save);
+  els.btnReset.addEventListener('click', reset);
+  els.btnTest.addEventListener('click', testConnection);
+}
+
+document.addEventListener('DOMContentLoaded', async () => {
+  wire();
+  await restore();
+});
+