fix(desktop): bind Side Conversation events to Host admission

apps/desktop/src/main/__tests__/desktop-transcript-range-store.test.ts

@@ -582,5 +582,6 @@ function continuitySnapshot() {
       followup: [],
     },
     interactions: { pending: [] },
+    rootTurnSourceMessageIds: [],
   };
 }

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

@@ -251,15 +251,24 @@ describe('permission response IPC boundary', () => {
       normalizeStopSessionInput({
         source: 'stop_button',
         expectedTurnId: 'turn-workhub',
+        expectedAdmissionId: 'side-admission',
         extra: true,
       }),
-      { source: 'stop_button', expectedTurnId: 'turn-workhub' },
+      {
+        source: 'stop_button',
+        expectedTurnId: 'turn-workhub',
+        expectedAdmissionId: 'side-admission',
+      },
     );
     assert.throws(() => normalizeStopSessionInput(null), /stop session input/);
     assert.throws(() => normalizeStopSessionInput({ source: 'toolbar' }), /stop session source/);
     assert.throws(
       () => normalizeStopSessionInput({ expectedTurnId: '' }),
       /expectedTurnId/,
     );
+    assert.throws(
+      () => normalizeStopSessionInput({ expectedAdmissionId: '' }),
+      /expectedAdmissionId/,
+    );
   });
 });

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

@@ -121,7 +121,7 @@ describe('quote companion disposal fencing', () => {
       ...defaults.sideChat,
       send: async () => {
         sends += 1;
-        return { ok: true as const };
+        return { ok: true as const, turnId: 'side-chat-turn' };
       },
     };
 
@@ -140,7 +140,7 @@ describe('quote companion disposal fencing', () => {
   });
 
   it('does not consume quotes or report success when disposal wins the send race', async () => {
-    const pendingSend = deferred<{ ok: true }>();
+    const pendingSend = deferred<{ ok: true; turnId: string }>();
     let disposed = false;
     let consumed = 0;
     const defaults = createFakeWorkbarServices();
@@ -158,7 +158,7 @@ describe('quote companion disposal fencing', () => {
     );
 
     disposed = true;
-    pendingSend.resolve({ ok: true });
+    pendingSend.resolve({ ok: true, turnId: 'side-chat-turn' });
 
     assert.deepEqual(await turn, { status: 'disposed' });
     assert.equal(consumed, 0);
@@ -179,7 +179,7 @@ describe('quote companion disposal fencing', () => {
       },
       send: async () => {
         sends += 1;
-        return { ok: true as const };
+        return { ok: true as const, turnId: 'side-chat-turn' };
       },
     };
     const turn = performCompanionTurn(