fix(client): work through the findings from the coverage pass

214 items came out of writing the tests. Real defects are corrected, dead code
is removed rather than covered, and the tests that pinned the old behaviour
move with them.

Also drops two agent coverage scratch files that slipped into the coverage PR
and adds the ignore rule that keeps them out.

client/src/components/Map/MapViewGL.test.tsx

@@ -909,6 +909,29 @@ describe('MapViewGL', () => {
     expect(queryByTestId('tooltip')).toBeNull()
   })
 
+  it('FE-COMP-MAPVIEWGL-067: hovering does not rebuild the markers under the cursor (#1404)', async () => {
+    loadOnAttach()
+    const places = [
+      buildMapPlace({ id: 41, lat: 48.41, lng: 2.41 }),
+      buildMapPlace({ id: 42, lat: 48.42, lng: 2.42 }),
+    ]
+
+    const { queryByTestId } = render(<MapViewGL places={places} fitKey={1} />)
+    await act(async () => {})
+    const before = glMarkers.created.length
+    const el = glMarkers.created[0].element
+
+    act(() => { el.dispatchEvent(new MouseEvent('mouseenter', { clientX: 10, clientY: 10 })) })
+    await act(async () => {})
+
+    // The hover card is component state, so it re-renders MapViewGL. The omitted
+    // collection props have to keep their identity across that render — a fresh
+    // `[]`/`{}` default would re-run the reconcile effects and recreate every
+    // marker, and a marker recreated under the pointer never fires mouseleave.
+    expect(queryByTestId('tooltip')).toBeTruthy()
+    expect(glMarkers.created).toHaveLength(before)
+  })
+
   it('FE-COMP-MAPVIEWGL-027: clicking a GPX track selects its place unless a marker or cluster is on top', async () => {
     loadOnAttach()
     const onMarkerClick = vi.fn()
@@ -1588,6 +1611,17 @@ describe('MapViewGL', () => {
     expect(photoService.fetchPhoto).toHaveBeenCalledWith('osm-5', '/api/maps/place-photo/abc', 48.5, 2.5, 'Museum')
   })
 
+  it('FE-COMP-MAPVIEWGL-066: a place with neither provider id nor coordinates has no cache key and is skipped', async () => {
+    render(<MapViewGL places={[
+      buildMapPlace({ id: 98, lat: null, lng: null, image_url: 'https://example.com/a.jpg' }),
+      buildMapPlace({ id: 99, lat: null, lng: null, image_url: 'https://example.com/b.jpg' }),
+    ]} fitKey={1} />)
+    await act(async () => {})
+
+    expect(photoService.fetchPhoto).not.toHaveBeenCalled()
+    expect(photoService.onThumbReady).not.toHaveBeenCalled()
+  })
+
   it('FE-COMP-MAPVIEWGL-057: no photos are fetched when place photos are switched off', async () => {
     useAuthStore.setState({ placesPhotosEnabled: false })