feat(webserver): unify button styles in default template - #217

Apply the input-field look of the Download button to all native
buttons across the default template, and turn the log page reset
links into proper buttons.

- style.css: extend the input styling rule to button elements so the
  native buttons on the Kad and Servers pages match the existing
  input[type=submit] buttons (blue border, white background).
- amuleweb-main-log.php: replace the (Reset log) and (Reset Serverinfo)
  text links with inline forms submitting a button (same pattern as the
  Servers page disconnect button), preserving the confirm() prompt and
  the target iframe. Each title and its reset button now sit on the same
  line via a flex row, with the button aligned right and extra vertical
  spacing before the iframe. The button text is kept short with a title
  attribute as alternative text.