fix(app): trace the row's corners with its press highlight

The highlight is an overlay inside the pressable rather than a background on
it, because the node Reanimated animates cannot also carry a themed Unistyles
style. An overlay inherits nothing, so a rounded sidebar row flashed square.

Take the corners from the pressable's own style. The row already declares its
shape once, and a highlight that restated it would be a second copy free to
drift; highlightStyle is left meaning only what the highlight is painted with.
Corners apply before it, so a caller can still depart from the row's shape.

packages/app/src/components/ui/press-highlight.native.tsx

@@ -2,6 +2,7 @@ import { forwardRef, useMemo } from "react";
 import { Pressable, StyleSheet, View } from "react-native";
 import { Gesture, GestureDetector } from "react-native-gesture-handler";
 import Animated, { useAnimatedStyle, useSharedValue } from "react-native-reanimated";
+import { resolveHighlightCorners } from "./press-highlight.shape";
 import type { PressHighlightProps } from "./press-highlight.types";
 
 export const PressHighlight = forwardRef<View, PressHighlightProps>(function PressHighlight(
@@ -9,6 +10,7 @@ export const PressHighlight = forwardRef<View, PressHighlightProps>(function Pre
   ref,
 ) {
   const highlighted = useSharedValue(0);
+  const corners = useMemo(() => resolveHighlightCorners(props.style), [props.style]);
   const animatedHighlightStyle = useAnimatedStyle(() => ({ opacity: highlighted.value }));
   // This gesture owns visual acknowledgement only. Pressable remains the sole owner of
   // activation, cancellation, accessibility, and the caller's drag/long-press callbacks.
@@ -29,8 +31,9 @@ export const PressHighlight = forwardRef<View, PressHighlightProps>(function Pre
 
   const highlight = highlightStyle ? (
     <Animated.View pointerEvents="none" style={[styles.highlight, animatedHighlightStyle]}>
-      {/* Keep the themed Unistyles node separate from the node Reanimated patches. */}
-      <View style={[styles.highlightFill, highlightStyle]} />
+      {/* Keep the themed Unistyles node separate from the node Reanimated patches. The
+          pressable's corners come first so `highlightStyle` can still override them. */}
+      <View style={[styles.highlightFill, corners, highlightStyle]} />
     </Animated.View>
   ) : null;
   const renderedChildren =

packages/app/src/components/ui/press-highlight.shape.test.ts

@@ -0,0 +1,38 @@
+import { describe, expect, it } from "vitest";
+import type { StyleProp, ViewStyle } from "react-native";
+import { resolveHighlightCorners } from "./press-highlight.shape";
+
+describe("resolveHighlightCorners", () => {
+  it("takes the radius from the pressable's own style, the way a sidebar row declares it", () => {
+    const row = { minHeight: 36, borderRadius: 8, backgroundColor: "#111" };
+    expect(resolveHighlightCorners(row)).toEqual({ borderRadius: 8 });
+  });
+
+  it("reads through the style array a row builds per interaction state", () => {
+    const row: StyleProp<ViewStyle> = [{ borderRadius: 8 }, false, { backgroundColor: "#222" }];
+    expect(resolveHighlightCorners(row)).toEqual({ borderRadius: 8 });
+  });
+
+  it("keeps the last radius when a later entry in the array reshapes the row", () => {
+    expect(resolveHighlightCorners([{ borderRadius: 8 }, { borderRadius: 999 }])).toEqual({
+      borderRadius: 999,
+    });
+  });
+
+  it("carries every corner a row sets individually", () => {
+    const row = { borderTopLeftRadius: 8, borderBottomRightRadius: 2, paddingLeft: 12 };
+    expect(resolveHighlightCorners(row)).toEqual({
+      borderTopLeftRadius: 8,
+      borderBottomRightRadius: 2,
+    });
+  });
+
+  it("returns no corners for a square row, rather than a zero it never asked for", () => {
+    expect(resolveHighlightCorners({ backgroundColor: "#111" })).toEqual({});
+    expect(resolveHighlightCorners(undefined)).toEqual({});
+  });
+
+  it("leaves a style resolved per press state alone", () => {
+    expect(resolveHighlightCorners(() => ({ borderRadius: 8 }))).toEqual({});
+  });
+});

packages/app/src/components/ui/press-highlight.shape.ts

@@ -0,0 +1,48 @@
+import { StyleSheet, type StyleProp, type ViewStyle } from "react-native";
+
+/**
+ * A press highlight is drawn as an overlay inside the pressable rather than as a background on
+ * it, because the node Reanimated animates cannot also carry the caller's themed style. An
+ * overlay inherits nothing, so a rounded row gets a square flash unless the corners are copied
+ * across.
+ *
+ * They are copied from the row's own style, not asked for again: the row already declares its
+ * shape once, and a highlight that had to restate it would be a second copy free to drift. That
+ * leaves `highlightStyle` to mean only what the highlight is painted with.
+ */
+const CORNER_PROPERTIES = [
+  "borderRadius",
+  "borderTopLeftRadius",
+  "borderTopRightRadius",
+  "borderBottomLeftRadius",
+  "borderBottomRightRadius",
+  "borderStartStartRadius",
+  "borderStartEndRadius",
+  "borderEndStartRadius",
+  "borderEndEndRadius",
+] as const;
+
+/**
+ * The corner radii a pressable's own style gives its highlight. A style resolved per press state
+ * is left alone — its shape is not knowable before the press it describes, and every corner it
+ * could name is one the caller can still set through `highlightStyle`.
+ */
+export function resolveHighlightCorners(
+  style: StyleProp<ViewStyle> | ((state: never) => StyleProp<ViewStyle>) | undefined,
+): ViewStyle {
+  if (typeof style === "function") {
+    return {};
+  }
+  const flattened = StyleSheet.flatten(style);
+  if (!flattened) {
+    return {};
+  }
+  const corners: ViewStyle = {};
+  for (const property of CORNER_PROPERTIES) {
+    const value = flattened[property];
+    if (value !== undefined) {
+      corners[property] = value;
+    }
+  }
+  return corners;
+}

packages/app/src/components/ui/press-highlight.types.ts

@@ -1,6 +1,13 @@
 import type { PressableProps, StyleProp, ViewStyle } from "react-native";
 
 export interface PressHighlightProps extends PressableProps {
-  /** Native finger-down surface. Desktop hover remains owned by the caller. */
+  /**
+   * What the native finger-down surface is painted with — a background colour, an opacity.
+   * Desktop hover remains owned by the caller.
+   *
+   * Shape is not part of it: the highlight takes its corners from the pressable's own `style`, so
+   * a rounded row gets a rounded flash without restating the radius. Set a corner here only to
+   * depart from the row's shape on purpose.
+   */
   highlightStyle?: StyleProp<ViewStyle>;
 }