fix(desktop): make compact tool label map type honest

The labels Record was annotated Record<CompactToolKind, ...> but only
spreads generic + developerToolLabels(), which excludes the buzz kind.
buzz is handled by an early return in compactToolLabel, so it never
indexes this map. Narrow the annotation to Exclude<CompactToolKind,
"buzz"> so tsc accepts it, and drop the redundant labelsMap re-cast.
No runtime behavior change.

Co-authored-by: Taylor Ho <taylorkmho@gmail.com>
Signed-off-by: Taylor Ho <taylorkmho@gmail.com>

desktop/src/features/agents/ui/agentSessionToolSummary.ts

@@ -131,7 +131,7 @@ function compactToolLabel(
   }
 
   const labels: Record<
-    CompactToolKind,
+    Exclude<CompactToolKind, "buzz">,
     { completed: string; running: string; failed: string }
   > = {
     generic: {
@@ -142,12 +142,7 @@ function compactToolLabel(
     ...developerToolLabels(),
   };
 
-  const labelsMap = labels as Record<
-    CompactToolKind,
-    { completed: string; running: string; failed: string }
-  >;
-
-  const set = labelsMap[kind];
+  const set = labels[kind];
   if (failed) return set.failed;
   if (running) return set.running;
   return set.completed;