Fix TESTING.md: clarify web coverage is on HF Space, not localhost

The Test Coverage section lives in the Space's index.html, not the
app's web GUI. Also note that WebKit is Safari's browser engine.

TESTING.md

@@ -35,8 +35,8 @@ pip install pytest-playwright
 playwright install --with-deps chromium firefox
 ```
 
-WebKit is available on some platforms (`playwright install webkit`) but is
-not required.
+WebKit (Safari's browser engine) is available on some platforms
+(`playwright install webkit`) but is not required.
 
 ## Running individual suites
 
@@ -152,10 +152,11 @@ hardware test results are available.
 
 ## Web coverage
 
-Open the Marionette app at `http://localhost:8042` and expand the
-**Test Coverage** panel near the bottom. It reads
-`marionette/static/test_coverage.json` (exported by `run_tests.py`)
-and shows the matrix, test catalog, and summary.
+The **Test Coverage** section on the
+[HuggingFace Space page](https://huggingface.co/spaces/RemiFabre/marionette)
+loads `marionette/static/test_coverage.json` (exported by `run_tests.py`)
+and shows the matrix, test catalog, and summary. It is part of the Space's
+`index.html`, not the app's web GUI at `localhost:8042`.
 
 ## Markers
 

marionette/static/test_coverage.json

@@ -1,6 +1,50 @@
 {
-  "generated_at": "2026-02-20T15:48:32.163033+00:00",
+  "generated_at": "2026-02-21T08:22:51.991423+00:00",
   "matrix": [
+    {
+      "os": "Linux",
+      "robot": "Lite",
+      "suite": "e2e",
+      "browser": "chromium",
+      "status": "pass",
+      "passed": 18,
+      "failed": 0,
+      "total": 18,
+      "date": "Feb 21"
+    },
+    {
+      "os": "Linux",
+      "robot": "Lite",
+      "suite": "e2e",
+      "browser": "firefox",
+      "status": "pass",
+      "passed": 18,
+      "failed": 0,
+      "total": 18,
+      "date": "Feb 21"
+    },
+    {
+      "os": "Linux",
+      "robot": "Lite",
+      "suite": "e2e",
+      "browser": "webkit",
+      "status": "pass",
+      "passed": 18,
+      "failed": 0,
+      "total": 18,
+      "date": "Feb 21"
+    },
+    {
+      "os": "Linux",
+      "robot": "Lite",
+      "suite": "unit",
+      "browser": null,
+      "status": "pass",
+      "passed": 66,
+      "failed": 0,
+      "total": 66,
+      "date": "Feb 21"
+    },
     {
       "os": "Linux",
       "robot": "None",
@@ -201,7 +245,7 @@
     },
     {
       "class": "TestStopEndpoints",
-      "count": 2,
+      "count": 3,
       "tier": "unit",
       "description": "POST /api/play/stop and /api/record/stop"
     }