fix(web): room for the title in the new ticket form

A field's label floats above its box and only other fields leave room
for it, so «Título» sat on the type selector. Also: the mention hint
had the shell's paragraph size instead of a hint's, and «Asignar a» and
«Release» offered «Todas las personas» / «Todas las releases», filter
words, for «nobody» and «none».

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

apps/web/src/styles.scss

@@ -406,6 +406,12 @@ h3 {
 .ts-form {
   display: grid;
   gap: 1rem;
+
+  // A field's label floats above its box; other fields leave room for it
+  // below them (their hint line), a segmented control does not.
+  > pi-segmented-control {
+    margin-bottom: 0.75rem;
+  }
 }
 
 .ts-form__row {