fix(approvals): isMachineId catches 20+ hex anywhere in string

Previous regex was anchored to whole string. Real EA2 display_names
embed the 32-hex case-key as a prefix ('25f89310... #7a9cd1d1'), so
they slipped through. Now any 20-char hex run anywhere in the string
flips the value to machine-shaped.

src/scenes/Approvals.tsx

@@ -26,7 +26,9 @@ function ageLabel(item: WorkItem): string {
 
 function isMachineId(s?: string | null): boolean {
   if (!s) return true;
-  return /^[a-f0-9]{20,}$/i.test(s) || /^process_\d{10,}$/.test(s);
+  if (/[a-f0-9]{20,}/i.test(s)) return true;
+  if (/^process_\d{10,}/.test(s)) return true;
+  return false;
 }
 
 function friendlyCaseTitle(item: WorkItem): string {