fix: wrap tooltip icon triggers in span for Radix compatibility

TooltipTrigger asChild requires a native element to forward props.
Lucide icon components did not reliably receive data-state and event
handlers, so tooltips on the check-failed and git-pending indicators
did not open. Wrapped each icon in a span.

frontend/src/components/sidebar/StackRow.tsx

@@ -117,12 +117,12 @@ export function StackRow(props: StackRowProps) {
           />
         ) : checkStatus === 'failed' ? (
           <RowTooltip
-            trigger={<AlertCircle className="w-3 h-3 text-muted-foreground/70" strokeWidth={1.5} />}
+            trigger={<span><AlertCircle className="w-3 h-3 text-muted-foreground/70" strokeWidth={1.5} /></span>}
             label={lastError ? `Update check failed: ${lastError}` : 'Update check failed'}
           />
         ) : hasGitPending ? (
           <RowTooltip
-            trigger={<GitBranch className="w-3 h-3 text-brand" strokeWidth={1.5} />}
+            trigger={<span><GitBranch className="w-3 h-3 text-brand" strokeWidth={1.5} /></span>}
             label="Git source update pending"
           />
         ) : null}