fix(ui): scale model name, icon, and TPS badge with font-size preference
The .msg-role (model name/icon header), .role-icon, .msg-role-name,
.msg-tps-inline, and .msg-time elements did not respond to the
data-font-size attribute on :root, causing them to appear
disproportionately small when users selected larger text sizes.
Add responsive CSS rules for small/large/xlarge font-size modes so
the chat role header scales proportionally alongside .msg-body text.
Also replaces the hardcoded inline style="font-size:12px" on the
assistant name span with a class-based rule (.msg-role-name) so the
responsive overrides can take effect.
Closes#5372
Co-Authored-By: Claude <noreply@anthropic.com>
@
nankingjing
8dd4d722c0
