Widen the work drawer and match generic card styling

The drawer grows to w-96 so the PR card's stats fit, and the container
wash is gone: the branch chip and card use the same attachment styling
as the generic link chips, directly on the chat background.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

desktop/src/features/chats/ui/ChatWorkPanel.tsx

@@ -35,25 +35,21 @@ export function ChatWorkPanel({
       aria-hidden={!open}
       className={cn(
         "flex shrink-0 flex-col overflow-hidden transition-[width,opacity] duration-300 ease-out",
-        open ? "w-80 opacity-100" : "pointer-events-none w-0 opacity-0",
+        open ? "w-96 opacity-100" : "pointer-events-none w-0 opacity-0",
       )}
       data-testid="chat-work-panel"
     >
       {/* Fixed-width inner wrapper so content never reflows mid-slide. */}
-      <div className="w-80 overflow-y-auto py-4 pl-1 pr-4">
-        <div className="flex flex-col gap-3 rounded-2xl bg-muted/40 p-3">
+      <div className="w-96 overflow-y-auto py-4 pl-1 pr-4">
+        <div className="flex flex-col gap-2">
           {branch ? (
-            <div className="flex items-center gap-1.5 rounded-lg bg-background/60 px-3 py-2 text-xs">
+            // Same attachment styling as the generic link chips.
+            <div className="flex items-center gap-1.5 rounded-2xl border border-border/70 bg-muted/30 px-3 py-2.5 text-xs">
               <GitBranch className="h-3.5 w-3.5 shrink-0 text-muted-foreground" />
               <span className="min-w-0 truncate font-mono">{branch}</span>
             </div>
           ) : null}
-          <GithubPullRequestCard
-            // Matches the branch chip: the card needs its own surface on the
-            // secondary container or the two read as one flat block.
-            className="w-full border-transparent bg-background/60 hover:bg-background/80"
-            preview={preview}
-          />
+          <GithubPullRequestCard className="w-full" preview={preview} />
         </div>
       </div>
     </aside>