test(e2e): delete missing-tracks.spec.js existence-check tests (task-340.4)

Remove 4 Playwright tests that only assert store methods/properties exist
via typeof checks. These are contract checks belonging in Vitest, not E2E.

Deleted tests:
- "should have UI store with missingTrackPopover methods"
- "should have library store with missing track support"
- "should have UI store with missingTrackModal property"
- "should have closeMissingTrackModal method on UI store"

Also removes the now-empty "Missing Track API Integration" describe block.
Remaining 19 missing-tracks tests (popover, modal, playback interception) pass.

Author: pythoninthegrass

app/frontend/tests/missing-tracks.spec.js

@@ -252,20 +252,6 @@ test.describe('Missing Track Popover', () => {
     await expect(popover).toBeVisible({ timeout: 5000 });
     await expect(popover).toContainText('Last seen');
   });
-
-  test('should have UI store with missingTrackPopover methods', async ({ page }) => {
-    const hasMethods = await page.evaluate(() => {
-      const ui = window.Alpine?.store('ui');
-      return (
-        'missingTrackPopover' in ui &&
-        typeof ui.openMissingTrackPopover === 'function' &&
-        typeof ui.closeMissingTrackPopover === 'function' &&
-        typeof ui.handlePopoverLocate === 'function' &&
-        typeof ui.handlePopoverIgnore === 'function'
-      );
-    });
-    expect(hasMethods).toBe(true);
-  });
 });
 
 test.describe('Missing Track Modal', () => {
@@ -395,41 +381,6 @@ test.describe('Missing Track Modal', () => {
   });
 });
 
-test.describe('Missing Track API Integration', () => {
-  // API is imported as an ES module in the app, not exposed on window.
-  // These tests verify the methods exist via the library store which uses the API.
-  test.beforeEach(async ({ page }) => {
-    const libraryState = createLibraryState();
-    await setupLibraryMocks(page, libraryState);
-    await page.goto('/');
-    await waitForAlpine(page);
-  });
-
-  test('should have library store with missing track support', async ({ page }) => {
-    const hasLibraryStore = await page.evaluate(() => {
-      const library = window.Alpine?.store('library');
-      return library !== undefined;
-    });
-    expect(hasLibraryStore).toBe(true);
-  });
-
-  test('should have UI store with missingTrackModal property', async ({ page }) => {
-    const hasModalProperty = await page.evaluate(() => {
-      const ui = window.Alpine?.store('ui');
-      return 'missingTrackModal' in ui;
-    });
-    expect(hasModalProperty).toBe(true);
-  });
-
-  test('should have closeMissingTrackModal method on UI store', async ({ page }) => {
-    const hasMethod = await page.evaluate(() => {
-      const ui = window.Alpine?.store('ui');
-      return typeof ui.closeMissingTrackModal === 'function';
-    });
-    expect(hasMethod).toBe(true);
-  });
-});
-
 test.describe('Missing Track Playback Interception', () => {
   test.beforeEach(async ({ page }) => {
     const libraryState = createLibraryState();

backlog/tasks/task-340.4 - Delete-missing-tracks.spec.js-existence-check-tests.md

@@ -1,10 +1,10 @@
 ---
 id: TASK-340.4
 title: Delete missing-tracks.spec.js existence-check tests
-status: In Progress
+status: Done
 assignee: []
 created_date: '2026-04-30 19:29'
-updated_date: '2026-04-30 19:30'
+updated_date: '2026-05-01 00:06'
 labels:
   - testing
   - e2e
@@ -33,7 +33,7 @@ Critical file:
 
 ## Acceptance Criteria
 <!-- AC:BEGIN -->
-- [ ] #1 4 existence-check tests deleted
-- [ ] #2 Remaining missing-tracks tests (popover, modal, playback interception) still green
-- [ ] #3 task test:e2e green
+- [x] #1 4 existence-check tests deleted
+- [x] #2 Remaining missing-tracks tests (popover, modal, playback interception) still green
+- [x] #3 task test:e2e green
 <!-- AC:END -->