chore: fix unused variable lint warnings in equipment check tests

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: JamesPHoughton

playwright/component-tests/equipment-check/AudioEquipmentCheck.ct.jsx

@@ -103,9 +103,8 @@ test('AEC-001: begin button starts flow', async ({ mount, page }) => {
   await setupGlobalsMock(page);
   await installAudioMocks(page);
 
-  let nextCalled = false;
   await mount(
-    <AudioEquipmentCheck next={() => { nextCalled = true; }} />,
+    <AudioEquipmentCheck next={() => {}} />,
     { hooksConfig: hooksConfig() },
   );
 

playwright/component-tests/equipment-check/HeadphonesCheck.ct.jsx

@@ -118,7 +118,7 @@ test('HC-001: headphones button reveals speaker selection', async ({ mount, page
   await installAudioMocks(page);
 
   const statuses = [];
-  const component = await mount(
+  await mount(
     <HeadphonesCheck
       setHeadphonesStatus={(s) => statuses.push(s)}
       setErrorMessage={() => {}}

playwright/component-tests/equipment-check/MicCheck.ct.jsx

@@ -112,7 +112,7 @@ test('MC-003: change mic resets to selection', async ({ mount, page }) => {
 });
 
 /** MC-004: No microphones triggers fail after timeout */
-test('MC-004: no microphones triggers fail', async ({ mount, page }) => {
+test('MC-004: no microphones triggers fail', async ({ mount }) => {
   let latestStatus = 'waiting';
   let latestError = null;