Fix cramped spacing of the Quick Actions search hint

The "Type to search, arrows to move, Enter to open." hint had no
margin, so it sat flush against the search input above while the
results list below it had a 10px margin + 8px padding before its
divider - lopsided spacing. Make .quick-actions a flex column with a
uniform 8px gap so the hint sits evenly between the input and the
results divider.

Co-Authored-By: Claude Sonnet 4.6 <[email protected]>

app/renderer/style.css

@@ -601,6 +601,9 @@ fieldset legend {
 
 .quick-actions {
   width: min(760px, 92vw);
+  display: flex;
+  flex-direction: column;
+  gap: 8px;
 }
 .quick-actions input {
   width: 100%;
@@ -608,7 +611,6 @@ fieldset legend {
   padding: 11px 12px;
 }
 .qa-results {
-  margin-top: 10px;
   max-height: 360px;
   overflow-y: auto;
   display: flex;