fix(desktop): open side conversations without a settled turn

apps/desktop/e2e/session-workbar.spec.ts

@@ -401,6 +401,14 @@ test('Side Chat survives collapse, confirms close, and cleans up on source switc
 
   const companion = page.locator('.maka-quote-companion');
   await expect(companion).toBeVisible();
+
+  // The companion forks lazily on the first send, not when the panel opens.
+  const sideComposer = companion.locator(COMPOSER_INPUT);
+  await sideComposer.fill('inspect this source without changing it');
+  await sideComposer.press('Enter');
+  await expect(companion).toContainText(
+    'Fake backend received: inspect this source without changing it',
+  );
   const firstForkId = await waitForCompanionForkId(page, sessionId);
   await expect(sidebar.locator(`[data-session-id=${JSON.stringify(firstForkId)}]`)).toHaveCount(0);
 
@@ -416,13 +424,6 @@ test('Side Chat survives collapse, confirms close, and cleans up on source switc
   await page.getByRole('button', { name: '展开任务工作栏' }).click();
   await expect(companion).toBeVisible();
 
-  const sideComposer = companion.locator(COMPOSER_INPUT);
-  await sideComposer.fill('inspect this source without changing it');
-  await sideComposer.press('Enter');
-  await expect(companion).toContainText(
-    'Fake backend received: inspect this source without changing it',
-  );
-
   const workbarToolbar = page.getByRole('toolbar', { name: '任务工作栏标签' }).first();
   const closeActiveSideChat = () =>
     workbarToolbar
@@ -449,6 +450,13 @@ test('Side Chat survives collapse, confirms close, and cleans up on source switc
   await expect(page.getByRole('list', { name: '打开工具' })).toBeVisible();
   await openSideChat.click();
   await expect(companion).toBeVisible();
+  // Fork again on the reopened panel's first send.
+  const reopenedComposer = companion.locator(COMPOSER_INPUT);
+  await reopenedComposer.fill('inspect once more before switching away');
+  await reopenedComposer.press('Enter');
+  await expect(companion).toContainText(
+    'Fake backend received: inspect once more before switching away',
+  );
   const secondForkId = await waitForCompanionForkId(page, sessionId);
 
   await sidebar.getByRole('button', { name: '新任务', exact: true }).click();

apps/desktop/src/main/__tests__/permission-response-ipc-boundary.test.ts

@@ -92,14 +92,28 @@ describe('permission response IPC boundary', () => {
       sourceTurnId: 'turn-2',
       turnId: 'turn-3',
     });
+    // A through-turn branch keeps its sourceTurnId; a spurious copyId is dropped.
+    assert.deepEqual(
+      normalizeBranchFromTurnInput({ sourceTurnId: 'turn-legacy', copyId: 'ignored-here' }),
+      { sourceTurnId: 'turn-legacy' },
+    );
     assert.deepEqual(
       normalizeBranchFromTurnInput({
         sourceTurnId: 'turn-3',
         name: '  Branch name  ',
         sideConversation: true,
         ignored: 1,
       }),
-      { sourceTurnId: 'turn-3', name: 'Branch name', sideConversation: true },
+      {
+        sourceTurnId: 'turn-3',
+        name: 'Branch name',
+        sideConversation: true,
+      },
+    );
+    // An empty side-conversation branch omits sourceTurnId entirely.
+    assert.deepEqual(
+      normalizeBranchFromTurnInput({ sideConversation: true }),
+      { sideConversation: true },
     );
     assert.deepEqual(
       normalizeRuntimeHostBranchFromTurnInput({
@@ -130,11 +144,23 @@ describe('permission response IPC boundary', () => {
 
     const invalidActions: Array<() => unknown> = [
       () => normalizeRegenerateTurnInput({ sourceTurnId: 'turn-1', turnId: 1 }),
-      () => normalizeBranchFromTurnInput({ sourceTurnId: 'turn-1', name: 1 }),
-      () => normalizeBranchFromTurnInput({ sourceTurnId: 'turn-1', sideConversation: 'yes' }),
-      () => normalizeBranchFromTurnInput({ sourceTurnId: 'x'.repeat(129) }),
+      () =>
+        normalizeBranchFromTurnInput({
+          sourceTurnId: 'turn-1',
+          name: 1,
+        }),
+      () =>
+        normalizeBranchFromTurnInput({
+          sourceTurnId: 'turn-1',
+          sideConversation: 'yes',
+        }),
+      () =>
+        normalizeBranchFromTurnInput({ sourceTurnId: 'x'.repeat(129) }),
       () => normalizeReviseBeforeTurnInput({ sourceTurnId: 1 }),
-      () => normalizeRuntimeHostBranchFromTurnInput({ sourceTurnId: 'turn-1' }),
+      () =>
+        normalizeRuntimeHostBranchFromTurnInput({
+          sourceTurnId: 'turn-1',
+        }),
       () => normalizeRuntimeHostReviseBeforeTurnInput({ sourceTurnId: 'turn-1', copyId: '' }),
     ];
     for (const action of invalidActions) assert.throws(action, /Invalid/);

apps/desktop/src/main/__tests__/quote-companion-disposal.test.ts

@@ -20,7 +20,10 @@
 import { deferred } from '@maka/core/test-only/async-primitives';
 import { strict as assert } from 'node:assert';
 import { afterEach, describe, it } from 'node:test';
-import type { SessionSummary, TurnRecord } from '@maka/core/session';
+import type {
+  SessionSummary,
+  TurnRecord,
+} from '@maka/core/session';
 import {
   abandonPendingCompanionCopy,
   createFakeWorkbarServices,