Feature requests for the Cookie manager

Hi Belim,

I'm happy about the introduction of the Cookie Manager in FluentCleaner Classic.

### I have a couple of suggestions to improve its handling:

1. Deleting a cookie resets the view of the cookie list to the first entry and hides the cursor. I'd prefer to simply remove the deleted cookie from the list and place the cursor either on the previous or next cookie entry.
2. A context-menu option to select all cookies would be neat.
3. The list headers "Cookies found" and "Cookies to keep" visually don't distinguish themselves from the cookie list.
4. The cookie manager doesn't properly detect all cookies. After deleting all cookies from the "Cookies found" list, checking with CCleaner still finds many active cookies (over 40 entries). I maintain a "Cookies to keep" list for both CCleaner and FluentCleaner. Currently, I can't get the contents of both lists to match because FluentCleaner doesn't detect as many cookies as CCleaner.

Start at the Cookie manager entry point and reproduce the four reported behaviors: deletion resets the list and cursor, there is no select-all context-menu action, the two list headers lack visual distinction, and detection differs from CCleaner. Done means the requested list interaction and styling work, plus cookie detection that can be compared against CCleaner for the reported entries.

Written by the indexing model from the issue text.