Move capture button left of search; always visible; disabled when server-disabled

- capture-btn moved to first child of trace-topbar (before search input)
- Button always visible: shows Start/Stop/Connect-to-server as before
- When server capture is disabled: grayed-out Start Capture with
  tooltip via existing i18n key 'Capture is disabled ...'
- No more hiding button when viewing saved session or when disabled
- Bump 1.22.4, SW cache v35->v36

frontend/sw.js

@@ -1,4 +1,4 @@
-const CACHE = 'simtrace-analyser-v35';
+const CACHE = 'simtrace-analyser-v36';
 
 const PRECACHE = [
     'index.html',