fix: stabilize renderer state and lifecycle updates

Prevent stale history, account, diagnostics, and language updates from repainting newer state. Keep queue virtualization, panel sizing, telemetry, cancellation, and runtime timing consistent across rapid UI changes. Strengthen painted-frame and lifecycle regression coverage, and brand packaged Windows metadata with the product publisher.

tests/upload-manager.test.js

@@ -159,6 +159,19 @@ describe('UploadManager', () => {
     assert.equal(summary.files.length, 2);
   });
 
+  it('emits a final idle stats snapshot after a normal batch', async () => {
+    const mgr = new UploadManager({});
+    const states = [];
+    mgr.on('stats', (stats) => states.push(stats.state));
+
+    await mgr.startBatch([
+      { file: '/test/video.mp4', hoster: 'doodstream.com', apiKey: 'key1' }
+    ]);
+
+    assert.equal(states.at(-1), 'idle');
+    assert.equal(mgr.statsInterval, null);
+  });
+
   it('retries on failure then succeeds', async () => {
     let callCount = 0;
     mockUploadFile.mock.mockImplementation(async (hoster, filePath, apiKey, onProgress) => {
@@ -230,7 +243,9 @@ describe('UploadManager', () => {
 
     const mgr = new UploadManager({});
     let batchDone = false;
+    const snapshots = [];
     mgr.on('batch-done', () => { batchDone = true; });
+    mgr.on('stats', (stats) => snapshots.push({ ...stats }));
 
     const batchPromise = mgr.startBatch([
       { file: '/test/video.mp4', hoster: 'doodstream.com', apiKey: 'key1' }
@@ -239,10 +254,16 @@ describe('UploadManager', () => {
     // Wait a bit then cancel
     await new Promise(r => setTimeout(r, 100));
     mgr.cancel();
+    const cancellingSnapshot = snapshots.at(-1);
 
     await batchPromise;
     assert.equal(mgr.running, false);
     assert.ok(batchDone, 'batch-done should be emitted even after cancel');
+    assert.equal(cancellingSnapshot.state, 'stopping');
+    assert.ok(cancellingSnapshot.activeJobs > 0);
+    assert.equal(snapshots.at(-1).state, 'idle');
+    assert.equal(snapshots.at(-1).activeJobs, 0);
+    assert.equal(mgr.statsInterval, null);
   });
 
   it('does not emit one aborted progress event per job when cancelling a whole batch', async () => {