style(room): drop the 1:1 peer name chip and restore the plain bold author label

src/app/components/message/layout/Stream.tsx

@@ -225,12 +225,7 @@ export const StreamLayout = as<'div', StreamLayoutProps>(
         </span>
         <div className={css.StreamColumn}>
           {header && (
-            <div
-              // Peer (incoming) names render in a chip the same dark surface as
-              // their message bubble; own names stay plain (own = plain text).
-              className={classNames(css.StreamName, !isOwn && css.StreamNamePeerBubble)}
-              ref={headerRef}
-            >
+            <div className={css.StreamName} ref={headerRef}>
               {header}
             </div>
           )}

src/app/components/message/layout/layout.css.ts

@@ -202,10 +202,7 @@ const StreamRailBridgeY = config.space.S400;
 // larger than chat body (T400 = 15px). The dot + timestamp vertically centre
 // on this line, so its line-height drives the rail geometry below.
 const StreamNameFontSize = toRem(16);
-// Line-height (not font) drives the name-chip height: 26.4px (20 × 1.2 × 1.1)
-// gives the peer name bubble more vertical breathing room around the 16px nick
-// while the dot + timestamp follow automatically via StreamHeaderInnerCenterY.
-const StreamNameLineHeight = toRem(26.4);
+const StreamNameLineHeight = toRem(20);
 
 // Vertical centre of the author-name line, measured from the row's
 // content-area top. The name is now the FIRST child of StreamColumn (track 3)
@@ -577,21 +574,6 @@ globalStyle(`${StreamName} > *`, {
   minWidth: 0,
 });
 
-// Peer (incoming) author name rendered as a chip in the SAME surface as the
-// message bubble (`color.Surface.Container`) — a mini incoming-bubble for the
-// label, with the same minimal all-corners rounding (user request). Own names
-// stay plain (own messages are plain text). Horizontal padding only — NO
-// vertical padding, so the name's line box (and the dot/timestamp aligned to
-// its centre) doesn't shift; the fill spans the line height.
-export const StreamNamePeerBubble = style({
-  backgroundColor: color.Surface.Container,
-  // Same rounding as the message bubble (user request); wider horizontal
-  // padding to match the taller chip.
-  borderRadius: StreamBubbleRadius,
-  paddingLeft: toRem(11),
-  paddingRight: toRem(11),
-});
-
 // Message-row timestamp — grid item in track 1, content-sized. Pushed
 // down by the same Y as StreamHeaderDotHalo so timestamp / dot / Username
 // share one baseline.