refactor(web): move the pin-as-column button to the far right of each toolbar

Place the "pin as column" icon after Clear/Export (rightmost) on the Logs,
History, and Network panel toolbars instead of at the front.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

clients/web/src/components/groups/NetworkStreamPanel/NetworkStreamPanel.tsx

@@ -114,7 +114,6 @@ export function NetworkStreamPanel({
       <Group justify="space-between" mb="sm">
         <Title order={4}>{formatTitle(filteredEntries.length)}</Title>
         <Group gap="xs">
-          {onPin ? <PinColumnButton onPin={onPin} /> : null}
           {hasResults && (
             <ListToggle compact={compact} onToggle={onToggleCompact} />
           )}
@@ -129,6 +128,7 @@ export function NetworkStreamPanel({
           <Button variant="default" onClick={onExport} disabled={!hasEntries}>
             Export
           </Button>
+          {onPin ? <PinColumnButton onPin={onPin} /> : null}
         </Group>
       </Group>