feat(ui): force every user and room avatar to render as a circle via globalStyle override on the folds Avatar wrapper

src/app/components/room-avatar/RoomAvatar.css.ts

@@ -1,4 +1,4 @@
-import { style } from '@vanilla-extract/css';
+import { globalStyle, style } from '@vanilla-extract/css';
 import { color } from 'folds';
 
 export const RoomAvatar = style({
@@ -12,3 +12,10 @@ export const RoomAvatar = style({
     },
   },
 });
+
+// See `UserAvatar.css.ts` for the rationale — same one-liner override forces
+// every RoomAvatar (rooms, spaces, DMs, bridged puppets) into a circle without
+// touching callsites.
+globalStyle(`*:has(> .${RoomAvatar})`, {
+  borderRadius: '50% !important',
+});

src/app/components/room-avatar/RoomAvatar.tsx

@@ -11,6 +11,9 @@ type RoomAvatarProps = {
   alt?: string;
   renderFallback: () => ReactNode;
 };
+// Always renders as a circle: a globalStyle in `RoomAvatar.css.ts` forces the
+// parent folds `<Avatar>` to `border-radius: 50%`, so the `radii` prop on the
+// outer `<Avatar>` is intentionally inert at every callsite.
 export function RoomAvatar({ roomId, src, alt, renderFallback }: RoomAvatarProps) {
   const [error, setError] = useState(false);
 

src/app/components/user-avatar/UserAvatar.css.ts

@@ -1,4 +1,4 @@
-import { style } from '@vanilla-extract/css';
+import { globalStyle, style } from '@vanilla-extract/css';
 import { color } from 'folds';
 
 export const UserAvatar = style({
@@ -12,3 +12,14 @@ export const UserAvatar = style({
     },
   },
 });
+
+// Force every UserAvatar to render as a circle. Folds `<Avatar>` controls the
+// outer shape via its `radii` variant; the inner `AvatarImage`/`AvatarFallback`
+// inherit `border-radius` from it. By overriding the parent's radius we round
+// every user avatar without touching the ~30 callsites or losing the radii
+// system for non-avatar uses of folds `<Avatar>` (icon tabs, emoji-pack tiles).
+// `!important` is necessary because folds' recipe rule has the same specificity
+// and source-order would otherwise be a coin flip.
+globalStyle(`*:has(> .${UserAvatar})`, {
+  borderRadius: '50% !important',
+});

src/app/components/user-avatar/UserAvatar.tsx

@@ -11,6 +11,9 @@ type UserAvatarProps = {
   alt?: string;
   renderFallback: () => ReactNode;
 };
+// Always renders as a circle: a globalStyle in `UserAvatar.css.ts` forces the
+// parent folds `<Avatar>` to `border-radius: 50%`, so the `radii` prop on the
+// outer `<Avatar>` is intentionally inert at every callsite.
 export function UserAvatar({ className, userId, src, alt, renderFallback }: UserAvatarProps) {
   const [error, setError] = useState(false);
 

src/app/features/bots/BotCard.tsx

@@ -53,7 +53,7 @@ export function BotCard({ preset, selected }: BotCardProps) {
               padding: `${toRem(6)} 0`,
             }}
           >
-            <Avatar size="300" radii="400" style={{ background: AVATAR_BG, color: '#0c0c0e' }}>
+            <Avatar size="300" radii="Pill" style={{ background: AVATAR_BG, color: '#0c0c0e' }}>
               {avatarUrl ? (
                 <AvatarImage src={avatarUrl} alt={preset.name} />
               ) : (

src/app/features/bots/BotShell.css.ts

@@ -97,18 +97,18 @@ export const HeroBack = style([
   },
 ]);
 
-// 56×56 square avatar with 14px radius, fleet violet (DAWN.fleet) bg.
-// Fleet color is hardcoded here because it's the canonical bot accent in
-// the mockup and we don't want it varying with Folds palette swaps. The
-// violet square shows when the bot's Matrix profile has no `avatar_url`
-// (fallback to the initial letter); when it does, the inner <img> covers
-// the violet — `overflow: hidden` keeps it inside the rounded corners.
+// 56×56 circular avatar, fleet violet (DAWN.fleet) bg. Fleet color is
+// hardcoded here because it's the canonical bot accent in the mockup and we
+// don't want it varying with Folds palette swaps. The violet disk shows when
+// the bot's Matrix profile has no `avatar_url` (fallback to the initial
+// letter); when it does, the inner <img> covers the violet — `overflow:
+// hidden` keeps it inside the round mask.
 export const HeroAvatar = style([
   DefaultReset,
   {
     width: toRem(56),
     height: toRem(56),
-    borderRadius: toRem(14),
+    borderRadius: '50%',
     backgroundColor: '#9580ff',
     color: '#0c0c0e',
     fontSize: toRem(24),
@@ -123,7 +123,6 @@ export const HeroAvatar = style([
       '(max-width: 600px)': {
         width: toRem(36),
         height: toRem(36),
-        borderRadius: toRem(8),
         fontSize: toRem(16),
       },
     },