Make Logs rows keyboard-operable and fix minute rounding

Rows open with Enter or Space and expose aria-expanded, so the View trace
action is reachable without a mouse. Durations round to whole seconds before
splitting, so 119.6 s reads 2m 00s instead of 1m 60s.

frontend/src/settings/Logs.tsx

@@ -429,7 +429,16 @@ function Log({
   return (
     <div className="group dark:hover:bg-accent hover:bg-muted w-full rounded-xl bg-transparent">
       <div
+        role="button"
+        tabIndex={0}
+        aria-expanded={isOpen}
         onClick={() => onToggle(log.id)}
+        onKeyDown={(e) => {
+          if (e.key === 'Enter' || e.key === ' ') {
+            e.preventDefault();
+            onToggle(log.id);
+          }
+        }}
         className={`text-foreground flex cursor-pointer flex-row items-start gap-2 p-2 px-4 py-3 ${
           isOpen ? 'dark:bg-background rounded-t-xl bg-[#F1F1F1]' : ''
         }`}

frontend/src/settings/traces/traceUtils.test.ts

@@ -94,6 +94,7 @@ describe('formatDurationMs', () => {
     [1234, '1.23 s'],
     [15432, '15.4 s'],
     [65000, '1m 05s'],
+    [119_600, '2m 00s'],
   ])('%s -> %s', (ms, expected) => {
     expect(formatDurationMs(ms)).toBe(expected);
   });

frontend/src/settings/traces/traceUtils.ts

@@ -78,8 +78,10 @@ export function formatDurationMs(ms: number | null | undefined): string {
   if (ms < 1000) return `${Math.round(ms)} ms`;
   if (ms < 10_000) return `${(ms / 1000).toFixed(2)} s`;
   if (ms < 60_000) return `${(ms / 1000).toFixed(1)} s`;
-  const minutes = Math.floor(ms / 60_000);
-  const seconds = Math.round((ms % 60_000) / 1000);
+  // Round to whole seconds before splitting, so 119.6 s reads 2m 00s, not 1m 60s.
+  const totalSeconds = Math.round(ms / 1000);
+  const minutes = Math.floor(totalSeconds / 60);
+  const seconds = totalSeconds % 60;
   return `${minutes}m ${String(seconds).padStart(2, '0')}s`;
 }