fix(app): preserve persisted theme styles after startup

Module-level style composites could materialize the temporary adaptive theme before persisted settings loaded. Keep Unistyles reads in render and guard against eager module-scope access.

packages/app/src/components/tree-primitives.tsx

@@ -51,7 +51,7 @@ export function TreeIndentGuides({ depth }: { depth: number }) {
 /** Rotating disclosure chevron for a directory row (points right; rotates down when expanded). */
 export function TreeChevron({ expanded }: { expanded: boolean }) {
   return (
-    <View style={expanded ? CHEVRON_EXPANDED_STYLE : styles.chevron}>
+    <View style={expanded ? [styles.chevron, styles.chevronExpanded] : styles.chevron}>
       <ThemedChevronRight size={16} uniProps={foregroundMutedIconColorMapping} />
     </View>
   );
@@ -76,7 +76,3 @@ const styles = StyleSheet.create((theme: Theme) => ({
     transform: [{ rotate: "90deg" }],
   },
 }));
-
-// Stable module-level style ref so TreeChevron passes a constant array, not one created
-// per render — satisfies react-perf (no inline-array prop) without a per-render useMemo.
-const CHEVRON_EXPANDED_STYLE = [styles.chevron, styles.chevronExpanded];