ui: use the same blue style for all three profiler list buttons

'Import profile' now matches 'New profile' and 'Profile from card'
(bg-blue-600). SW cache v62 -> v63.

frontend/sw.js

@@ -1,4 +1,4 @@
-const CACHE = 'otaman-v62';
+const CACHE = 'otaman-v63';
 const URLS = [
   'index.html',
   'help.html',