style(webserver): unify form controls in default template - #206

Make the default web template form controls visually consistent:

- Add the same thin 1px solid #003161 border to select dropdowns so they
  match the text inputs instead of using the browser's native chunky
  border.
- Replace the 'trebuchet ms' font with a more common and robust stack
  (Helvetica, Arial, sans-serif) across all form controls (label, input,
  select, textarea), aligning with the rest of the stylesheet.
- Add the same thin border to the log boxes (logframe and srvframe
  iframes) on the log page.
- Add a small right margin to the status select on the downloads page
  to separate it from the adjacent category combo.