Unify input font size and padding (text-sm, px-3 py-2.5)

Inputs rendered at different sizes: the SearchSelect was 54px tall with a 16px
font (the wrapper's p-2 and the inner box's forms-plugin padding stacked, and
the wrapper had no text-sm), and the string-criterion filter input had no
text-sm (16px) with p-2. Native inputs are 42px / 14px / px-3 py-2.5.

Align both to the native size:
- SearchSelect wrapper supplies px-3 py-2.5 + text-sm and the inner search box
  zeroes its own padding (p-0), so the field is one 42px row like an input.
- String filter input gets text-sm + px-3 py-2.5.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

common/components/filters.py

@@ -1572,7 +1572,8 @@ def StringFilter(
         ("placeholder", placeholder),
         (
             "class",
-            "w-full rounded-base border border-default-medium p-2 "
+            # text-sm + px-3 py-2.5 match every other input (canonical size).
+            "w-full rounded-base border border-default-medium px-3 py-2.5 text-sm "
             "bg-neutral-secondary-medium text-body "
             "focus:border-brand focus:ring-brand "
             # No transition-* here: with transition-all the border-color animated