Decouple stats daemon and preserve final mine OSD status

- Run `subminer stats -b` as a dedicated daemon process, independent from the overlay app
- Stop Anki progress spinner before showing final `✓`/`x` mine result so it is not overwritten
- Keep grammar/noise subtitle tokens hoverable while stripping annotation metadata

launcher/main.test.ts

@@ -536,7 +536,7 @@ exit 0
       assert.equal(result.status, 0, `stdout:\n${result.stdout}\nstderr:\n${result.stderr}`);
       assert.match(
         fs.readFileSync(capturePath, 'utf8'),
-        /^--stats\n--stats-response-path\n.+\n--log-level\ndebug\n$/,
+        /^--stats-daemon-start\n--stats-response-path\n.+\n--stats-daemon-open-browser\n--log-level\ndebug\n$/,
       );
     });
   },